{"title":"Intercom Accessories","description":"From batteries, belt clips, antennas, charging stations, Y-cables, four-wire interfaces, and more, Dale Pro Audio has what you need to extend the functionality of your intercom system. We carry the industry’s top brands, such as HME, Clear-Com, Telex, and Studio Technologies.","products":[{"product_id":"telex-aef-2-plastic-covered-metal-earloop-holds-eartip-or-receiver-in-place-on-the-ear","title":"RTS AEF-2 Plastic Covered Metal Earloop - holds Eartip or Receiver in Place on the Ear","description":"\u003cp\u003ePlastic-Covered Metal Earloop. The nylon or plastic covered metal earloop holds the eartip or receiver in place on the ear.\u003c\/p\u003eThis is usef with Telex and other brands of single earbud IFB earphones for more discreet, and secure, cable placement. 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Depending on the componenet pieces selected, users can construct a version of the Announcer's Earset that best suits their particular needs.","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754133329,"sku":"44646","price":16.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_11bbd38c-d321-4ea3-a48d-d8cf9c9326d3.jpg?v=1768552685"},{"product_id":"telex-bpa-1-1-4-wave-beltpack-antenna-for-many-rts-products","title":"RTS BPA-1 1\/4 Wave Beltpack Antenna (for Many RTS Products)","description":"\u003cp\u003e1\/4 Wave Beltpack Antenna, 425-488 MHz, for RTS Intercom such as TR-1\/700\/800\/825\/80N\/RKP-4.\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754134673,"sku":"44685","price":61.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_f8c83d1f-6df0-49e4-8efc-79edc5a73a8d.jpg?v=1768552685"},{"product_id":"telex-bpa2-1-4-wave-belt-pack-antenna-488-556-mhz-band","title":"RTS BPA2 1\/4 Wave Belt Pack Antenna (488-556 MHz Band)","description":"\u003cp\u003eBPA2 1\/4 Wave Belt Pack Antenna (488-556 MHz Band)\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754134737,"sku":"44686","price":61.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_5193cb4a-bc44-4e0d-8801-436b7c0e88a2.jpg?v=1768561636"},{"product_id":"telex-bpa-3-1-4-wave-beltpack-antenna-556-636-mhz","title":"RTS BPA-3 1\/4 Wave Beltpack Antenna (556-636 MHz)","description":"\u003cp\u003e 1\/4 Wave Beltpack Antenna (556-636 MHz)\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754135377,"sku":"44687","price":61.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_64a1f024-3f99-4311-af83-66085443c223.jpg?v=1768557158"},{"product_id":"telex-he-30-30-foot-headset-extension-cable-a4m-to-a4f","title":"RTS HE-30 30 Foot Headset Extension Cable (A4M to A4F)","description":"\u003cp\u003eTelex\/RTS headset extension cable, A4 (Telex\/RTS Standard) female to male.\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754139857,"sku":"44800","price":181.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_efb9e695-0a67-44ab-93e8-782cf9f02469.jpg?v=1768557161"},{"product_id":"telex-sbc-1-swiveling-beltclip-for-tr-700-and-tr-800-wireless-intercom-beltpacks","title":"RTS SBC-1 Swiveling Beltclip for TR-700 and TR-800 Wireless Intercom Beltpacks","description":"\u003cp\u003eThe Telex SBC-1 is a rotating detachable beltclip enabling quicker access to the front and rear panel controls of the Telex TR-700 and TR-800 wireless intercom beltpacks.\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754144273,"sku":"45435","price":38.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_0dc752aa-47d5-4356-9d78-5150d8e2bb5e.jpg?v=1768550914"},{"product_id":"telex-tw-5w-1x5-two-channel-3-pin-xlr-type-passive-splitter","title":"RTS TW-5W 1X5 Two-Channel 3-Pin XLR Type Passive Splitter","description":"\u003cp\u003eAudiocom: 1 x 5 3 pin XLR type Passive Splitter. Features a rugged metal box for portable floor interconnect. RTS-TW: 1 x 5 Two channel 3 pin XLR type Passive Splitter. Features a rugged metal box for portable floor interconnect.\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754152081,"sku":"56681","price":314.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_fa9fe6b2-baad-4f47-a52b-82f19c9ad436.jpg?v=1768550915"},{"product_id":"telex-bp-800-nm-nimh-battery-pack-for-tr1-700-800-825-80n-rkp-4","title":"RTS BP-800-NM NiMH Battery Pack for TR1\/700\/800\/825\/80N\/RKP-4","description":"\u003cp\u003eThe BP-800-NM is a NiMH battery pack designed to be used with TR-700 and TR-800 wireless communication beltpacks.\u003c\/p\u003e","brand":"RTS","offers":[{"title":"Default Title","offer_id":37754181457,"sku":"304031","price":188.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_847740d0-9a3f-45b3-a326-e6635f2b111b.jpg?v=1768557159"},{"product_id":"studio-technologies-31084-line-input-card-for-model-200-series","title":"Studio Technologies 31084 Line Input Card for Model 200-Series","description":"\u003cp\u003eAllows technician to add line-level input to models 210 and 212 announcer's consoles; maximum two per unit. Installs in back-panel spare connector location. Card features 3-pin female XLR-type connector and isolation transformer. Kit includes card, interface cable, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755588753,"sku":"24241","price":44.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_0658cb38-44b3-4689-8f6d-4c826077ff09.jpg?v=1761295932"},{"product_id":"studio-technologies-31086-line-output-card-kit-for-models-212-and-230","title":"Studio Technologies 31086 Line Output Card Kit for Models 212 and 230","description":"\u003cp\u003eStudio Technologies Studiocomm 31086 Line Output Card Kit for Model 230\u003c\/p\u003eAllows technician to add second line-level output (–10 dBu nominal) to Model 230 Announcer's Console. Installs in back-panel spare connector location. Card features 3-pin male XLR-type connector and isolation transformer. Kit includes card, interface cable, and hardware.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755588881,"sku":"24242","price":44.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_cb912a1f-1230-40a6-8920-b39e8ae971e3.jpg?v=1761297728"},{"product_id":"studio-technologies-31058-direct-microphone-output-card-kit-for-models-212-220-230-and-233","title":"Studio Technologies 31058 Direct Microphone Output Card Kit for Models 212, 220, 230, and 233","description":"\u003cp\u003eStudio Technologies Studiocomm 31058 Direct Microphone Output Card Kit\u003c\/p\u003e\n\u003cp\u003eAllows technician to add direct microphone output to Models 212, 220, 230, and 233 Announcer's Consoles. Installs in back-panel spare connector location. Card features 3-pin male XLR-type connector. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755682193,"sku":"62275","price":64.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_0dcdafc9-f615-4ca4-83a9-928ad70e4f74.jpg?v=1761297829"},{"product_id":"studio-technologies-13595-6-pin-headset-connector-assembly-for-model-200-series","title":"Studio Technologies 13595 6-Pin Headset Connector Assembly for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 13595 Model 200-Series 6-Pin Headset Connector Assembly\u003c\/p\u003eAllows technician to easily add 6-pin female XLR-type connector (Switchcraft® pin arrangement) to Model 200-Series Announcer's Consoles. Provides support for headsets that use 6-pin plug for mic and dual earpiece connections. Installs in back-panel spare-connector location.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755683025,"sku":"65283","price":68.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_1c1582e5-5512-4407-b637-6e330ed8f2b9.jpg?v=1761205158"},{"product_id":"studio-technologies-31202-3-pin-male-xlr-connector-card-kit-for-model-200-series","title":"Studio Technologies 31202 3-Pin Male XLR Connector Card Kit for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 31202 3-Pin Male XLR Connector Card Kit\u003c\/p\u003eAllows technician to add \"mult\" or special function connector to Model 200-Series Announcer's Consoles. Installs in back-panel spare connector location. Card features 3-pin male XLR-type connector. Kit includes card, interface cable, and hardware.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755683793,"sku":"67421","price":34.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_5fd59546-a60d-415b-bb3b-9c8a5befa960.jpg?v=1761295979"},{"product_id":"studio-technologies-13561-7-pin-headset-connector-assembly-for-model-200-series","title":"Studio Technologies 13561 7-Pin Headset Connector Assembly for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 13561 7-Pin Headset Connector Assembly\u003c\/p\u003eAllows technician to easily add 7-pin female XLR-type connector to Model 200-Series Announcer's Consoles. Provides support for headsets that use 7-pin plug for mic and dual earpiece connections. Installs in back-panel spare-connector location.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755698897,"sku":"76660","price":68.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_721dbe70-54d6-45d3-be55-bacbd6b43856.jpg?v=1761293268"},{"product_id":"studio-technologies-31211-backup-microphone-output-card-kit-for-models-210-211-220-230-and-233","title":"Studio Technologies 31211 Backup Microphone Output Card Kit for Models 210, 211, 220, 230, and 233","description":"\u003cp\u003eAllows technician to create an audio output that automatically switches between the main output signal and the microphone input connection. Used to provide an automatic \"fail-over\" connection for specialized on-air broadcast applications. Installs in back-panel spare connector location in Models 210,220, 230, and 233 Announcer's Consoles. Card features 3-pin male XLR-type connector and high-reliability sealed electro-mechanical relay. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755699153,"sku":"76661","price":64.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_e1d9c8be-5a88-46c2-9304-da8ddfd6049a.jpg?v=1761207081"},{"product_id":"studio-technologies-31210-line-input-with-limiter-card-kit-for-model-200-series","title":"Studio Technologies 31210 Line Input with Limiter Card Kit for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 31210 Line Input with Limiter Card Kit \u003c\/p\u003eAllows technician to add line-level input to Models 210, 212, 220, 230, and 233 Announcer's Consoles. Sophisticated VCA-based circuitry minimizes the chance that abnormally high input signal levels will cause listener discomfort. Installs in back-panel spare connector location; maximum two per unit. Card features 3-pin female XLR-type connector, isolation transformer, and high-density surface-mount-technology circuitry. Kit includes card, interface cables, and hardware.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755699217,"sku":"76662","price":95.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_d95e9238-85f4-47f7-bf89-27179e7564d8.jpg?v=1761305842"},{"product_id":"studio-technologies-31201-3-pin-female-xlr-connector-card-kit-for-model-200-series","title":"Studio Technologies 31201 3-Pin Female XLR Connector Card Kit for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 31201 3-Pin Female XLR Connector Card Kit\u003c\/p\u003eAllows technician to add \"mult\" or special function connector to Model 200-Series Announcer's Consoles. Installs in back-panel spare connector location. Card features 3-pin female XLR-type connector. Kit includes card, interface cable, and hardware.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755699345,"sku":"76663","price":34.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_40ac93a4-87f9-4960-9f07-f43d80e348c0.jpg?v=1761291446"},{"product_id":"studio-technologies-31206-4-pin-female-xlr-connector-card-kit-for-model-200-series","title":"Studio Technologies 31206 4-Pin Female XLR Connector Card Kit for Model 200-Series","description":"\u003cp\u003eAllows technician to add special function connector to Model 200-Series Announcer’s Consoles. Installs in backpanel spare connector location. Card features 4-pin female XLR-type connector. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755699473,"sku":"76664","price":51.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_59ec770a-09af-409d-8251-041a02eb7466.jpg?v=1761291447"},{"product_id":"studio-technologies-remote-switch-inputs-card-kit-for-model-200-series","title":"Studio Technologies Remote Switch Inputs Card Kit for Model 200-Series","description":"\u003cp\u003eAllows technician to add connector to provide access to remote switch inputs of Models 210, 212, 220, 230, and 233 Announcer’s Consoles. Installs in back-panel spare connector location. Card features 4-pin female XLR-type connector. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755699537,"sku":"76665","price":51.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_26d3e129-46a9-4c20-92bc-cbbab7f63ccb.jpg?v=1761306772"},{"product_id":"studio-technologies-31203-tally-remote-switch-input-card-kit-for-models-212-220-and-230","title":"Studio Technologies 31203 Tally\/Remote Switch Input Card Kit for Models 212, 220 and 230","description":"\u003cp\u003eStudio Technologies Studiocomm 31203 Tally\/Remote Switch Input Card Kit for Models 212, 220 and 230\u003c\/p\u003eAllows technician to add status output (\"tally\") and remote switch input to Models 212, 220 and 230 Announcer's Consoles.Installs in back-panel spare connector location. Card features 3-pin female XLR connector and circuitry that provides current-limited 5 volt DC output and remote switch input. Kit includes card, interface cables, and hardware.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755700369,"sku":"76666","price":64.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_f6f1a3a0-4c35-4173-a8a5-bfcb9328bee3.jpg?v=1761207082"},{"product_id":"studio-technologies-31207-ethercon-connector-card-kit-for-model-200-series","title":"Studio Technologies 31207 EtherCon Connector Card Kit for Model 200-Series","description":"\u003cp\u003eAllows technician to add Neutrik® EtherCon 8-pin modular Ethernet-style connector to Model 200-Series Announcer's Consoles. Installs in back-panel spare connector location. Allows power and up to three input or output functions to be carried over one standard data cable. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755700497,"sku":"76667","price":51.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_a0c94b63-00fc-402e-b11b-59a0a0279d52.jpg?v=1761295976"},{"product_id":"studio-technologies-program-talkback-card-kit-for-model-200-series","title":"Studio Technologies Program\/Talkback Card Kit for Model 200-Series","description":"\u003cp\u003eAllows technician to create an audio signal that switches between an external program source and a talkback output to Models 212, 220, 230, and 233 Announcer’s Consoles. Installs in back-panel spare connector location. Card features 3-pin male XLR-type connector. Kit includes card, interface cables, and hardware.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755700561,"sku":"76668","price":51.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_dbcdfa71-dfd7-4422-9f87-5cee939d7509.jpg?v=1761305843"},{"product_id":"studio-technologies-31087-interface-cable-kit-for-model-200-series","title":"Studio Technologies 31087 Interface Cable Kit for Model 200-Series","description":"\u003cp\u003eStudio Technologies Studiocomm 31087 Interface Cable Kit for Model 200-Series\u003c\/p\u003eSimplifies process of adding additional XLR-type connectors or implementing custom functions to Model 200-Series announcer console products. Interface cable consists of 3-position connector with associated 12-inch long interconnecting wires. 3-position connector mates directly with \"headers\" located on announcer console circuit board assemblies.Each kit includes five cable assembles and one length heat-shrinkable tubing.","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755700881,"sku":"76680","price":30.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_dc5fe629-80da-4542-8f61-e29cfb684bd9.jpg?v=1761291447"},{"product_id":"studio-technologies-model-5110s-mic-line-input-module-smpte-version","title":"Studio Technologies Model 5110S Mic\/Line Input Module (SMPTE Version)","description":"\u003cp\u003eThe Model 5110 Mic\/Line Input Module is a compact, self-contained 2-channel module intended for use in custom broadcast, live-performance, and general audio applications. Offering a building block of resources, the Model 5110 provides two channels of high-performance audio capability in an easy-to-use yet technically sophisticated package. The module's basic functions include selectable input gain, 48 volt phantom power, status LED indicators, and analog and digital audio outputs. Module operation requires only an externally-provided source of 12 volts DC. Advanced features include user control lock out, metadata insertion, and remote monitoring\/control capability.\u003c\/p\u003e \u003cp\u003eApplications for the Model 5110 include sports broadcasting booth packages, remote news gathering fly-packs, stadium audio\/video interface (I\/O) locations, and government\/corporate\/performance space infrastructure projects. The number of Model 5110 modules used in a project can vary widely—from one to dozens. And in each case the Model 5110's performance will be completely pro with audio quality, reliability, and installation flexibility matching that of large-scale consoles, routers, and transport resources. Typical applications will find the Model 5110's analog and digital outputs being interfaced with inputs on fiber-optic transport modules, audio\/video routers, and broadcast\/production consoles.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eModel 5110 Mic\/Line Input Modules do not include a mounting enclosure or chassis. They are intended for mounting in custom 19-inch rack panels, equipment boxes, broadcast furniture, or other specialized settings. It is expected that integration firms will create applications that use Model 5110 modules as part of complete broadcast, production, corporate, and government solutions.\u003c\/p\u003e \r\n\u003cp\u003eTwo microphone or line-level audio signals can be connected to the Model 5110's front panel XLR-type connectors. Using the front-panel pushbutton switches, the sensitivity of each input can be adjusted to one of four gain settings: line (unity), 15 dB, 30 dB, or 45 dB. To support high-performance microphones +48 volt phantom power can be selected as required. Status LEDs are provided to display the current settings of the sensitivity and phantom power. A 7-segment LED level meter is also provided for each channel.\u003c\/p\u003e \r\n\u003cp\u003eSix pushbutton switches on the Model 5110's front panel allow rapid selection of the input gain and phantom power on\/off status. A simple button-press sequence allows the six pushbutton switches to be temporarily \"locked out\" to prevent accidental adjustment. This can be very useful in field applications, helping to ensure that unauthorized Model 5110 performance changes are not made. An LED indicator will light to alert users that pushbutton switch functionality has been disabled.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5110's audio performance is simply excellent. A low-noise, wide dynamic-range preamplifier section ensures that the input audio quality is preserved. The outputs of the mic-preamp circuitry are routed to two analog audio output sections. These provide line-level, balanced (differential), capacitor-coupled outputs.\u003c\/p\u003e \r\n\u003cp\u003eThe audio from the mic-preamps is also routed to high-performance analog-to-digital conversion (ADC) sections that support a sample rate of 48 kHz with a bit depth of 24. A precision voltage reference assists the ADC circuits in performing accurate conversion. The signals, now in the digital domain, are formatted into AES3id digital audio. This 2-channel digital bit stream is output as a 75 ohm unbalanced signal for direct connection into broadcast applications.\u003c\/p\u003e \r\n\u003cp\u003eAll audio inputs and outputs were carefully designed for use in permanent as well as field applications. Extensive filtering on the inputs minimizes the chance that radio frequency (RF) energy will interfere with audio input sources. Other components were included to address ESD (\"static\") and DC overload situations. The DC power input is protected from accidental polarity reversal.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5110 requires an external source of nominal 12 volts DC for operation. The acceptable input voltage range is 10 to 18 allowing a variety of power sources to be utilized. Internal power supply circuitry within the Model 5110 creates the voltages required for the analog and digital circuitry.\u003c\/p\u003e \r\n\u003cp\u003eStandard connectors are used throughout the Model 5110. Input audio connections are made using gold-plated 3-pin female XLR-type connectors. A DIN 1.0\/2.3 coaxial connector is used to interface with the digital audio output. The 2-channel analog audio outputs use a 5-position, 0.1-inch \"header\" connector. The DC power input and data bus signals use a 4-position, 0.1-inch header. Low-cost IDC (insulation displacement) mating connectors allow simple interconnection with the analog audio output and DC\/data signals.\u003c\/p\u003e \r\n\u003cp\u003eFor compliance with international broadcast audio level standards two versions of the Model 5110 are available. The Model 5110S supports the SMPTE® audio standards which have an analog audio reference level of +4 dBu and a digital audio reference level of –20 dBFS (SMPTE RP155). The Model 5110E supports applications that require European Broadcast Union (EBU) compliance where the analog audio reference level is 0 dBu and the digital audio reference level is –18 dBFS (EBU R68).\u003c\/p\u003e \r\n\u003cp\u003eProvision has been made in the Model 5110's hardware and firmware to support insertion of metadata information into its AES3id digital audio output. Following the Audio Engineering Society's AES52-2006 standard, this metadata can be used to include source location identification data within the audio data stream. While not currently commonly implemented, it is expected that AES3 metadata will become an important part of many infrastructures.\u003c\/p\u003e \r\n\u003cp\u003eUsing an optional remote access module, up to eight Model 5110 modules can be remotely monitored and controlled. Using the remote access module's Ethernet interface and SNMP MIB objects, personnel using \"GUI\" applications or remote control systems will be able to access all the Model 5110's functions, including input sensitivity, phantom power on\/off, pushbutton switch lock out, and metadata insertion. A local 2-wire RS-485 data bus is used to interface the remote access module with the one or more Model 5110 Mic\/Line Input Modules\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755929745,"sku":"479423","price":525.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_20827f0b-202a-4737-834a-d731b5157ed8.jpg?v=1761224031"},{"product_id":"studio-technologies-model-5110e-mic-line-input-module-ebu-version","title":"Studio Technologies Model 5110E Mic\/Line Input Module (EBU Version)","description":"\u003cp\u003eThe Model 5110 Mic\/Line Input Module is a compact, self-contained 2-channel module intended for use in custom broadcast, live-performance, and general audio applications. Offering a building block of resources, the Model 5110 provides two channels of high-performance audio capability in an easy-to-use yet technically sophisticated package. The module's basic functions include selectable input gain, 48 volt phantom power, status LED indicators, and analog and digital audio outputs. Module operation requires only an externally-provided source of 12 volts DC. Advanced features include user control lock out, metadata insertion, and remote monitoring\/control capability.\u003c\/p\u003e \u003cp\u003eApplications for the Model 5110 include sports broadcasting booth packages, remote news gathering fly-packs, stadium audio\/video interface (I\/O) locations, and government\/corporate\/performance space infrastructure projects. The number of Model 5110 modules used in a project can vary widely—from one to dozens. And in each case the Model 5110's performance will be completely pro with audio quality, reliability, and installation flexibility matching that of large-scale consoles, routers, and transport resources. Typical applications will find the Model 5110's analog and digital outputs being interfaced with inputs on fiber-optic transport modules, audio\/video routers, and broadcast\/production consoles.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eModel 5110 Mic\/Line Input Modules do not include a mounting enclosure or chassis. They are intended for mounting in custom 19-inch rack panels, equipment boxes, broadcast furniture, or other specialized settings. It is expected that integration firms will create applications that use Model 5110 modules as part of complete broadcast, production, corporate, and government solutions.\u003c\/p\u003e \r\n\u003cp\u003eTwo microphone or line-level audio signals can be connected to the Model 5110's front panel XLR-type connectors. Using the front-panel pushbutton switches, the sensitivity of each input can be adjusted to one of four gain settings: line (unity), 15 dB, 30 dB, or 45 dB. To support high-performance microphones +48 volt phantom power can be selected as required. Status LEDs are provided to display the current settings of the sensitivity and phantom power. A 7-segment LED level meter is also provided for each channel.\u003c\/p\u003e \r\n\u003cp\u003eSix pushbutton switches on the Model 5110's front panel allow rapid selection of the input gain and phantom power on\/off status. A simple button-press sequence allows the six pushbutton switches to be temporarily \"locked out\" to prevent accidental adjustment. This can be very useful in field applications, helping to ensure that unauthorized Model 5110 performance changes are not made. An LED indicator will light to alert users that pushbutton switch functionality has been disabled.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5110's audio performance is simply excellent. A low-noise, wide dynamic-range preamplifier section ensures that the input audio quality is preserved. The outputs of the mic-preamp circuitry are routed to two analog audio output sections. These provide line-level, balanced (differential), capacitor-coupled outputs.\u003c\/p\u003e \r\n\u003cp\u003eThe audio from the mic-preamps is also routed to high-performance analog-to-digital conversion (ADC) sections that support a sample rate of 48 kHz with a bit depth of 24. A precision voltage reference assists the ADC circuits in performing accurate conversion. The signals, now in the digital domain, are formatted into AES3id digital audio. This 2-channel digital bit stream is output as a 75 ohm unbalanced signal for direct connection into broadcast applications.\u003c\/p\u003e \r\n\u003cp\u003eAll audio inputs and outputs were carefully designed for use in permanent as well as field applications. Extensive filtering on the inputs minimizes the chance that radio frequency (RF) energy will interfere with audio input sources. Other components were included to address ESD (\"static\") and DC overload situations. The DC power input is protected from accidental polarity reversal.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5110 requires an external source of nominal 12 volts DC for operation. The acceptable input voltage range is 10 to 18 allowing a variety of power sources to be utilized. Internal power supply circuitry within the Model 5110 creates the voltages required for the analog and digital circuitry.\u003c\/p\u003e \r\n\u003cp\u003eStandard connectors are used throughout the Model 5110. Input audio connections are made using gold-plated 3-pin female XLR-type connectors. A DIN 1.0\/2.3 coaxial connector is used to interface with the digital audio output. The 2-channel analog audio outputs use a 5-position, 0.1-inch \"header\" connector. The DC power input and data bus signals use a 4-position, 0.1-inch header. Low-cost IDC (insulation displacement) mating connectors allow simple interconnection with the analog audio output and DC\/data signals.\u003c\/p\u003e \r\n\u003cp\u003eFor compliance with international broadcast audio level standards two versions of the Model 5110 are available. The Model 5110S supports the SMPTE® audio standards which have an analog audio reference level of +4 dBu and a digital audio reference level of –20 dBFS (SMPTE RP155). The Model 5110E supports applications that require European Broadcast Union (EBU) compliance where the analog audio reference level is 0 dBu and the digital audio reference level is –18 dBFS (EBU R68).\u003c\/p\u003e \r\n\u003cp\u003eProvision has been made in the Model 5110's hardware and firmware to support insertion of metadata information into its AES3id digital audio output. Following the Audio Engineering Society's AES52-2006 standard, this metadata can be used to include source location identification data within the audio data stream. While not currently commonly implemented, it is expected that AES3 metadata will become an important part of many infrastructures.\u003c\/p\u003e \r\n\u003cp\u003eUsing an optional remote access module, up to eight Model 5110 modules can be remotely monitored and controlled. Using the remote access module's Ethernet interface and SNMP MIB objects, personnel using \"GUI\" applications or remote control systems will be able to access all the Model 5110's functions, including input sensitivity, phantom power on\/off, pushbutton switch lock out, and metadata insertion. A local 2-wire RS-485 data bus is used to interface the remote access module with the one or more Model 5110 Mic\/Line Input Modules\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755929937,"sku":"479424","price":525.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_1a111a03-1af0-48a2-907f-586836158bab.jpg?v=1761219184"},{"product_id":"studio-technologies-model-5190-remote-access-module","title":"Studio Technologies Model 5190 Remote Access Module","description":"\u003cp\u003eAllows remote access of up to eight Model 5100-Series Modules. Provides 10\/100 Ethernet connection, integrated web server, and SNMP monitor and control support. Requires 12 Vdc for operation. Self-contained assembly can be mounted on wall surface or in an existing enclosure. \u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755930065,"sku":"479429","price":695.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_2779c4d4-9981-4848-b2ab-a1a830b3b2f3.jpg?v=1761224033"},{"product_id":"studio-technologies-tab-01-talent-amplifier-mounting-adapter-kit-for-models-32a-33a-34-and-36","title":"Studio Technologies TAB-01 Talent Amplifier Mounting Adapter Kit for Models 32A, 33A, 34, and 36","description":"\u003cp\u003eSet of two brackets used for mounting Models 32A, 33A, or 34 Talent Amplifiers or Model 36 Talent Interface underneath desk, production set, etc.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37755947025,"sku":"500079","price":34.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_324c543b-1d94-4b13-b7be-8cf940baf409.jpg?v=1761219204"},{"product_id":"studio-technologies-13579-5-pin-headset-connector-assembly-for-model-200-series","title":"Studio Technologies 13579 5-Pin Headset Connector Assembly for Model 200-Series","description":"\u003cp\u003eAllows technician to easily add 5-pin female XLR-type connector (Switchcraft® pin arrangement) to Model 200-Series Announcer’s Consoles. Provides support for headsets that use 5-pin plug for mic and single earpiece connections. Installs in back-panel spare-connector location.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37756000145,"sku":"571623","price":68.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_a16eefd3-0c5b-48d8-87f8-e6efc07a64f2.jpg?v=1761299615"},{"product_id":"studio-technologies-model-5132-partyline-interface-module-smpte-version","title":"Studio Technologies Model 5132 Partyline Interface Module (SMPTE Version)","description":"\u003cp\u003eThe Model 5132 Party-Line Interface Module is a compact, self-contained unit for use in custom broadcast, live-performance, and general party-line intercom applications. The module provides a high-quality 2-channel party-line to analog line-level (\"4-wire\") audio signal interface in an easy to use yet technically sophisticated package. The module's basic functions include two channels of 2-wire-to-4-wire conversion with auto-null capability, input and output level metering, a +28 Vdc party-line power source with two channels of 200 ohm intercom audio termination, and DC output control and status monitoring. With the internal party-line power source enabled, beltpack user devices can be directly connected. Alternatively, the Model 5132 can be connected into an existing party-line circuit that includes a power source and intercom audio terminations. Two analog inputs and two analog outputs interface the Model 5132 with a variety of external audio transport, matrix intercom, and infrastructure equipment. Module operation requires only an externally-provided source of 12 Vdc. Advanced features include remote control and monitoring capability when installed with a Studio Technologies' Model 5190 Remote Access Module.\u003c\/p\u003e \r\n\u003cp\u003eApplications for the Model 5132 include sports broadcasting booth packages, remote news gathering \"fly packs,\" stadium audio\/video interface (I\/O) locations, and government\/corporate\/performance space\/aerospace test infrastructure projects. The number of Model 5132 modules used in a project can vary widely—from one to dozens. And in each case the performance will be completely \"pro\" with audio quality, reliability, and installation flexibility matching that of larger-scale products. Typical applications will find the Model 5132's line-level audio inputs and outputs being interfaced with fiber-optical transport modules, matrix intercom systems, and audio\/video routers. The flexibility of the Model 5132's party-line intercom interface allows direct connection to either intercom beltpack devices or an existing party-line intercom circuit.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132 provides a full-featured 2-channel interface which includes two 2-wire-to-4-wire hybrid circuits with automatic nulling capability. The analog hybrid circuitry provides excellent audio quality and high return-loss. Audio level meters provide confirmation of system performance during setup and operation. The Model 5132's party-line interface is accessible using a 3-pin male XLR connector. This allows industry-standard party-line intercom user beltpacks to be directly interfaced. With a maximum output current of 180 milliamperes (mA), up to three of the popular RTS® BP325 devices can be directly connected. Devices from Clear-Com® are also compatible.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132 is directly compatible with applications that must interface with existing party-line intercom circuits. The internal power source and 200 ohm terminations can be disabled by way of a pushbutton switch on the Model 5132's front panel.\u003c\/p\u003e \r\n\u003cp\u003eThe line-level audio inputs and outputs were carefully designed for use in permanent as well as field applications. Filtering on the inputs and outputs minimizes the chance that radio frequency (RF) energy will interfere with the audio signals. Other components were included to address ESD (\"static\") and DC over-voltage conditions. The party-line power source is monitored for protection against damage due to fault conditions. In addition, the module's DC power input is protected from accidental polarity reversal.\u003c\/p\u003e \r\n\u003cp\u003eFor operation, the Model 5132 only requires connection of an analog audio input, an analog audio output, and an external source of nominal 12 Vdc. The acceptable input voltage range is 10 to 18, allowing a variety of power sources to be utilized. Power supply circuitry within the Model 5132 creates the voltages required for the analog and digital circuitry.\u003c\/p\u003e \r\n\u003cp\u003eStandard connectors are used throughout the Model 5132. Users will access the party-line intercom interface using a 3-pin male XLR connector. The line-level audio input and output connections are made using 5-position \"header\" connectors. The DC power input and data bus connections use a 4-position header. Low-cost IDC (insulation displacement connector) mating sockets allow simple interconnection between the headers and the audio input, audio output, DC input, and RS-485 data signals.\u003c\/p\u003e \r\n\u003cp\u003eFor compliance with international broadcast audio level standards two versions of the Model 5132 are available. The Model 5132S supports SMPTE® audio levels where the analog audio reference level is +4 dBu. The Model 5132E supports applications that require European Broadcast Union (EBU) compliance with an analog audio reference level of 0 dBu.\u003c\/p\u003e \r\n\u003cp\u003eModel 5132 Party-Line Interface Modules do not include a mounting enclosure or chassis. They are intended for mounting in custom 19-inch rack panels, equipment boxes, broadcast furniture, \"NEMA\" I\/O boxes, or other specialized enclosures. It is expected that integration firms will create applications that use Model 5132 modules as part of complete broadcast, production, corporate, and government solutions. Sophisticated users will be able to create \"one-off\" solutions to solve unique challenges.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eParty-Line Interface\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132's party-line interface is very flexible, offering excellent performance when operating both \"stand alone\" or interconnected with an existing intercom circuit. When enabled, the internal party-line intercom power supply circuitry provides a low-noise, current-limited source with a nominal 28 Vdc output. Termination networks provide the required 200 ohm impedance for the audio signals associated with the two party-line intercom channels. With these features the Model 5132's party-line intercom interface is essentially identical to that created by stand-alone intercom power supplies or powered master stations.\u003c\/p\u003e \r\n\u003cp\u003eTwo LEDs, located on the Model 5132's front panel, provide an indication of the power source's on\/off state and the state of the DC voltage present on pin 2 of the party-line intercom XLR connector. Logic circuitry contained within the Model 5132 monitors the voltage on pin 2. When the Model 5132 is providing intercom power this function will monitor pin 2 for a low-voltage\/over-current condition. If detected, the DC output will automatically enter a protection mode. Once the fault condition is removed normal operation will again resume. When an external source of intercom power is present the Pin 2 Status LED offers the user a simple \"go\/no go\" indication for rapid troubleshooting.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eAnalog Hybrids with Auto Nulling\u003c\/strong\u003e\u003cbr\u003e \r\nThe 2-wire-to-4-wire hybrids provide low noise, low distortion, good frequency response, and high return-loss (\"nulling\"), even when presented with a wide range of party-line conditions. Unlike telephone-line (\"POTS\") oriented DSP-based hybrid circuits, the Model 5132's analog circuitry maintains extended frequency response. With this wide audio bandwidth, natural-sounding voice signals can be sent to, and received from, the connected party-line user devices. This bandwidth also allows high-frequency \"call light\" and \"mic kill\" signals to pass through to connected equipment.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132's sophisticated auto nulling function uses analog circuitry under microprocessor control to achieve significant trans-hybrid loss. This return-loss \"null\" is achieved by making a series of software-directed adjustments to account for the resistive, inductive, and capacitive conditions that are present on the connected party-line user devices and associated cabling, as well as, if present, a connected external intercom circuit. Whenever a user presses the Model 5132's Auto Null pushbutton digital circuitry adjusts the 2-wire-to-4-wire hybrids to achieve their maximum return-loss for both interface channels. The nulling process is automatic, lasting less than 15 seconds, and only takes place upon user request. The resulting null parameters are stored in non-volatile memory.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eAudio Inputs and Outputs\u003c\/strong\u003e\u003cbr\u003e \r\nTwo analog line-level inputs and outputs are associated with the \"4-wire\" audio portion of the Model 5132's circuitry. These are intended to interconnect with a variety of devices, including matrix intercom systems, audio-over-fiber transport systems, and specialized audio equipment. The audio input and output circuitry is electronically balanced and capacitor coupled to minimize the chance that hum, noise, or interfacing issues will occur. The two Model 5132 versions allow compatibility with equipment that supports SMPTE (+4 dBu) and EBU (0 dBu) analog audio level standards.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eIndicators\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132 contains four 5-segment LED level meters. Two meters display the level of the signals being received from the party-line channels and two display the level being sent to the party-line channels. At the time of installation and setup the meters are invaluable in helping to confirm correct operation. During normal operation the meters offer rapid confirmation of the audio signals flowing into and out of the module. Four additional LED indicators are also provided offering status indications of the internal party-line power supply, pin 2 status, auto null, and remote control data functions.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003ePro Audio Quality\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132's audio circuitry was designed in the spirit of professional audio equipment rather than that found in typical party-line intercom devices. High-performance components are used throughout, providing low-distortion, low-noise, and high headroom. The internal party-line power source offers a unique level of performance—its ability to deliver power while maintaining audio quality is simply unmatched.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37756000785,"sku":"571628","price":795.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_b27cfb09-20fc-43f8-b91b-7cca0ac63e3c.jpg?v=1761224219"},{"product_id":"studio-technologies-model-5132-partyline-interface-module-ebu-version","title":"Studio Technologies Model 5132 Partyline Interface Module (EBU Version)","description":"\u003cp\u003eThe Model 5132 Party-Line Interface Module is a compact, self-contained unit for use in custom broadcast, live-performance, and general party-line intercom applications. The module provides a high-quality 2-channel party-line to analog line-level (\"4-wire\") audio signal interface in an easy to use yet technically sophisticated package. The module's basic functions include two channels of 2-wire-to-4-wire conversion with auto-null capability, input and output level metering, a +28 Vdc party-line power source with two channels of 200 ohm intercom audio termination, and DC output control and status monitoring. With the internal party-line power source enabled, beltpack user devices can be directly connected. Alternatively, the Model 5132 can be connected into an existing party-line circuit that includes a power source and intercom audio terminations. Two analog inputs and two analog outputs interface the Model 5132 with a variety of external audio transport, matrix intercom, and infrastructure equipment. Module operation requires only an externally-provided source of 12 Vdc. Advanced features include remote control and monitoring capability when installed with a Studio Technologies' Model 5190 Remote Access Module.\u003c\/p\u003e \r\n\u003cp\u003eApplications for the Model 5132 include sports broadcasting booth packages, remote news gathering \"fly packs,\" stadium audio\/video interface (I\/O) locations, and government\/corporate\/performance space\/aerospace test infrastructure projects. The number of Model 5132 modules used in a project can vary widely—from one to dozens. And in each case the performance will be completely \"pro\" with audio quality, reliability, and installation flexibility matching that of larger-scale products. Typical applications will find the Model 5132's line-level audio inputs and outputs being interfaced with fiber-optical transport modules, matrix intercom systems, and audio\/video routers. The flexibility of the Model 5132's party-line intercom interface allows direct connection to either intercom beltpack devices or an existing party-line intercom circuit.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132 provides a full-featured 2-channel interface which includes two 2-wire-to-4-wire hybrid circuits with automatic nulling capability. The analog hybrid circuitry provides excellent audio quality and high return-loss. Audio level meters provide confirmation of system performance during setup and operation. The Model 5132's party-line interface is accessible using a 3-pin male XLR connector. This allows industry-standard party-line intercom user beltpacks to be directly interfaced. With a maximum output current of 180 milliamperes (mA), up to three of the popular RTS® BP325 devices can be directly connected. Devices from Clear-Com® are also compatible.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132 is directly compatible with applications that must interface with existing party-line intercom circuits. The internal power source and 200 ohm terminations can be disabled by way of a pushbutton switch on the Model 5132's front panel.\u003c\/p\u003e \r\n\u003cp\u003eThe line-level audio inputs and outputs were carefully designed for use in permanent as well as field applications. Filtering on the inputs and outputs minimizes the chance that radio frequency (RF) energy will interfere with the audio signals. Other components were included to address ESD (\"static\") and DC over-voltage conditions. The party-line power source is monitored for protection against damage due to fault conditions. In addition, the module's DC power input is protected from accidental polarity reversal.\u003c\/p\u003e \r\n\u003cp\u003eFor operation, the Model 5132 only requires connection of an analog audio input, an analog audio output, and an external source of nominal 12 Vdc. The acceptable input voltage range is 10 to 18, allowing a variety of power sources to be utilized. Power supply circuitry within the Model 5132 creates the voltages required for the analog and digital circuitry.\u003c\/p\u003e \r\n\u003cp\u003eStandard connectors are used throughout the Model 5132. Users will access the party-line intercom interface using a 3-pin male XLR connector. The line-level audio input and output connections are made using 5-position \"header\" connectors. The DC power input and data bus connections use a 4-position header. Low-cost IDC (insulation displacement connector) mating sockets allow simple interconnection between the headers and the audio input, audio output, DC input, and RS-485 data signals.\u003c\/p\u003e \r\n\u003cp\u003eFor compliance with international broadcast audio level standards two versions of the Model 5132 are available. The Model 5132S supports SMPTE® audio levels where the analog audio reference level is +4 dBu. The Model 5132E supports applications that require European Broadcast Union (EBU) compliance with an analog audio reference level of 0 dBu.\u003c\/p\u003e \r\n\u003cp\u003eModel 5132 Party-Line Interface Modules do not include a mounting enclosure or chassis. They are intended for mounting in custom 19-inch rack panels, equipment boxes, broadcast furniture, \"NEMA\" I\/O boxes, or other specialized enclosures. It is expected that integration firms will create applications that use Model 5132 modules as part of complete broadcast, production, corporate, and government solutions. Sophisticated users will be able to create \"one-off\" solutions to solve unique challenges.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eParty-Line Interface\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132's party-line interface is very flexible, offering excellent performance when operating both \"stand alone\" or interconnected with an existing intercom circuit. When enabled, the internal party-line intercom power supply circuitry provides a low-noise, current-limited source with a nominal 28 Vdc output. Termination networks provide the required 200 ohm impedance for the audio signals associated with the two party-line intercom channels. With these features the Model 5132's party-line intercom interface is essentially identical to that created by stand-alone intercom power supplies or powered master stations.\u003c\/p\u003e \r\n\u003cp\u003eTwo LEDs, located on the Model 5132's front panel, provide an indication of the power source's on\/off state and the state of the DC voltage present on pin 2 of the party-line intercom XLR connector. Logic circuitry contained within the Model 5132 monitors the voltage on pin 2. When the Model 5132 is providing intercom power this function will monitor pin 2 for a low-voltage\/over-current condition. If detected, the DC output will automatically enter a protection mode. Once the fault condition is removed normal operation will again resume. When an external source of intercom power is present the Pin 2 Status LED offers the user a simple \"go\/no go\" indication for rapid troubleshooting.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eAnalog Hybrids with Auto Nulling\u003c\/strong\u003e\u003cbr\u003e \r\nThe 2-wire-to-4-wire hybrids provide low noise, low distortion, good frequency response, and high return-loss (\"nulling\"), even when presented with a wide range of party-line conditions. Unlike telephone-line (\"POTS\") oriented DSP-based hybrid circuits, the Model 5132's analog circuitry maintains extended frequency response. With this wide audio bandwidth, natural-sounding voice signals can be sent to, and received from, the connected party-line user devices. This bandwidth also allows high-frequency \"call light\" and \"mic kill\" signals to pass through to connected equipment.\u003c\/p\u003e \r\n\u003cp\u003eThe Model 5132's sophisticated auto nulling function uses analog circuitry under microprocessor control to achieve significant trans-hybrid loss. This return-loss \"null\" is achieved by making a series of software-directed adjustments to account for the resistive, inductive, and capacitive conditions that are present on the connected party-line user devices and associated cabling, as well as, if present, a connected external intercom circuit. Whenever a user presses the Model 5132's Auto Null pushbutton digital circuitry adjusts the 2-wire-to-4-wire hybrids to achieve their maximum return-loss for both interface channels. The nulling process is automatic, lasting less than 15 seconds, and only takes place upon user request. The resulting null parameters are stored in non-volatile memory.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eAudio Inputs and Outputs\u003c\/strong\u003e\u003cbr\u003e \r\nTwo analog line-level inputs and outputs are associated with the \"4-wire\" audio portion of the Model 5132's circuitry. These are intended to interconnect with a variety of devices, including matrix intercom systems, audio-over-fiber transport systems, and specialized audio equipment. The audio input and output circuitry is electronically balanced and capacitor coupled to minimize the chance that hum, noise, or interfacing issues will occur. The two Model 5132 versions allow compatibility with equipment that supports SMPTE (+4 dBu) and EBU (0 dBu) analog audio level standards.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003eIndicators\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132 contains four 5-segment LED level meters. Two meters display the level of the signals being received from the party-line channels and two display the level being sent to the party-line channels. At the time of installation and setup the meters are invaluable in helping to confirm correct operation. During normal operation the meters offer rapid confirmation of the audio signals flowing into and out of the module. Four additional LED indicators are also provided offering status indications of the internal party-line power supply, pin 2 status, auto null, and remote control data functions.\u003c\/p\u003e \r\n\u003cp\u003e\u003cstrong\u003ePro Audio Quality\u003c\/strong\u003e\u003cbr\u003e \r\nThe Model 5132's audio circuitry was designed in the spirit of professional audio equipment rather than that found in typical party-line intercom devices. High-performance components are used throughout, providing low-distortion, low-noise, and high headroom. The internal party-line power source offers a unique level of performance—its ability to deliver power while maintaining audio quality is simply unmatched.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37756000849,"sku":"571629","price":795.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_179c35a7-859e-4910-a9cf-235f02a472d9.jpg?v=1761219269"},{"product_id":"studio-technologies-model-46a-dual-2-wire-to-4-wire-intercom-interface","title":"Studio Technologies Model 46A Dual 2-Wire to 4-Wire Intercom Interface","description":"\u003cp\u003eThe Model 46A is designed to interface 2-wire full-duplex party-line (PL) intercom circuits with 4-wire audio circuits associated with matrix intercom systems. Other specialized audio system interfacing applications can also be supported. The Model 46A provides two independent full-featured 2-channel interfaces. Each interface contains two hybrid circuits which include automatic nulling capability. The analog circuitry, under software control, provides excellent audio quality and high return-loss. The interfaces are compatible with powered and unpowered 2-wire party-line circuits. They are capable of supplying DC power, allowing direct operation of devices such as user beltpacks. Configuration settings allow the 2-wire and 4-wire interface circuitry to be compatible with a range of nominal signal levels. Audio level meters provide user confirmation of system performance during setup and operation. Applications for the Model 46A include television sports and special event broadcasting, theme park and theater installations, corporate events, and industrial testing environments. Standard audio connectors are used for all input and output signals. The Model 46A mounts in one space of a standard 19-inch rack enclosure and requires 100-240 V, 50\/60 Hz for operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTwo 2-channel party-line intercom interfaces\u003c\/li\u003e\n\u003cli\u003eFour analog hybrids with auto null capability\u003c\/li\u003e\n\u003cli\u003eInput and output level metering\u003c\/li\u003e\n\u003cli\u003eExcellent audio quality\u003c\/li\u003e\n\u003cli\u003eIntegrated intercom power sources\u003c\/li\u003e\n\u003cli\u003eStandard audio connectors\u003c\/li\u003e\n\u003cli\u003eTransformer-coupled 4-wire inputs and outputs\u003c\/li\u003e\n\u003cli\u003eUniversal input mains powered\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e The Model 46A's 2-wire interfaces are optimized for direct connection with 2-channel party-line intercom circuits. In addition, single-channel party-line intercom circuits can also be connected. Many broadcast applications use the 2-channel TW-Series from RTS®, including their popular BP325 beltpack. Other industry-standard single- and 2-channel PL intercom systems, including those from Clear-Com®, are also directly compatible. To provide optimal signal matching and interface performance the nominal level of the Model 46A's 2-wire interfaces can be selected. Using DIP switches, accessible on the front panel, the nominal levels can be selected to be either -10 or -14 dBu, settings that should allow compatibility with virtually all party-line systems. For example, for applications that use equipment from RTS the -10 dBu setting is appropriate. For other equipment, such as that from Clear-Com, the -14 setting is correct.\u003c\/p\u003e\u003cp\u003eThe Model 46A's 2-wire interfaces can correctly function with powered (\"wet\") or unpowered (\"dry\") intercom circuits. Powered circuits have a DC voltage present, typically provided by power supplies such as the RTS PS31 or Clear-Com PS-232. This DC power, normally 30-32 V, provides energy for connected devices such as user stations or beltpacks. In this type of application the Model 46A is configured to operate in its external 2-wire power source mode. In this mode the Model 46A's circuitry maintains the required high-impedance load and, as in all cases, draws no power from the party-line circuit. An auto-terminate function ensures that should a \"wet\" circuit not be connected, the Model 46A's interface circuitry will remain stable. This unique feature makes certain that objectionable audio signals, including oscillations and \"squeals,\" will infrequently be sent to the connected 4-wire device.\u003c\/p\u003e\u003cp\u003eA significant capability of the Model 46A's 2-wire interfaces is their ability to supply DC power and 200 ohm AC termination to the connected intercom circuits. Referred to as the Model 46A's internal 2-wire power source mode, the 30 V output can power devices such as user stations and beltpacks. In many applications this will eliminate the need for external intercom power supplies. Besides reducing total system cost, this feature can also lower system weight, reduce required mounting space, and decrease the mains energy requirement.\u003c\/p\u003e\u003cp\u003eWith each 2-wire interface's ability to supply up to 315 milliamperes (mA) of current, a typical broadcast application that uses two sets of three BP325 beltpacks can easily be supported. Each interface's 30 V DC intercom power source ensures that systems requiring long intercom cable runs will function correctly. The circuitry's output regulation is such that little change in the output voltage will occur over its entire rated output current. Also, the unique design of the power supply circuitry virtually eliminates the noise and \"hiss\" associated with typical intercom power supply performance. Under software control the output of the DC power supplies are monitored for over-current and short-circuit conditions. This allows protection shut-down of the output DC, as well as providing an alert by way of a visual indicator.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAnalog Hybrids with Auto Nulling\u003c\/strong\u003e\u003cbr\u003e A key reason that the Model 46A's interfaces achieve excellent audio performance is the design of the 2-wire-to-4-wire hybrid circuits. They provide low noise and distortion, good frequency response, and high return-loss (\"nulling\"), even when presented with a wide range of 2-wire conditions. Unlike telephone-line (\"POTS\") oriented DSP-based hybrid circuits, the Model 46A's analog circuitry provides extended frequency response. With a pass band of 100 Hz on the low end and 8 kHz on the high end, natural-sounding voice signals can be sent to, and received from, the 2-wire party-line circuits.\u003c\/p\u003e\u003cp\u003eA hybrid's ability to isolate the transmit signal from the receive signal in the 2-wire-to-4-wire interface is critical. The quality of this isolation, technically known as return-loss or trans-hybrid loss, is measured in dB. A high value is important, especially in applications where multiple 2-wire-to-4-wire interfaces are used together. Remote sports broadcast applications are especially sensitive to this requirement. The Model 46A's sophisticated auto nulling function uses analog circuitry under microprocessor control to achieve significant trans-hybrid loss. This return-loss \"null\" is achieved by making a series of adjustments to account for the resistive, inductive, and capacitive conditions that are present on the connected 2-wire party-line circuit. The party-line's conditions are the sum of the impact made by the type and quantity of cable, the connected user-devices, and the intercom power source.\u003c\/p\u003e\u003cp\u003eWhenever a user presses one of the Model 46A's auto null buttons digital circuitry adjusts the analog hybrids to rapidly achieve their maximum return-loss. The nulling process takes less than 10 seconds for each channel of an interface. However, it's important to note that while the nulling process is automatic, it only takes place upon user request. This can lead to more stable and consistent audio performance when a hybrid is exposed to the varying 2-wire conditions often found in broadcast applications. The parameters obtained during the nulling process are stored in non-volatile memory; mains power interruptions won't require the auto nulling function to again be performed.\u003c\/p\u003e\u003cp\u003eA sine-wave audio tone is generated for use during the auto nulling process. The frequency is software-controlled to maximize the ability of the hybrid circuits to reach a \"deep\" null. In addition, at the beginning of each auto null sequence a short period of 24 kHz tone is sent to the associated 2-wire party-line interface. This serves as a microphone disable (\"mic kill\") signal for user devices such as the RTS BP325. By automatically disabling \"open\" microphones the auto nulling process can achieve better performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e4-Wire Interfaces\u003c\/strong\u003e\u003cbr\u003e Associated with the 4-wire portion of the Model 46A's interfaces are analog line-level inputs and outputs. These are intended to interconnect with a variety of 4-wire devices, including matrix intercom systems, audio-over-fiber transmission systems, and other specialized audio equipment. The input and output circuitry is transformer-coupled to minimize the chance of hum, noise, or ground \"loop\" issues. A key characteristic of the Model 46A's design is the ability to select the 4-wire input and output nominal levels. This helps to ensure compatibility with virtually all audio equipment. Front-panel-accessible DIP switches allow the nominal levels to be configured from among four choices: 0, +4, +6, or +8 dBu. The 0 dBu setting was specifically provided for compatibility with Clear-Com matrix intercom systems. The +4 dBu setting allows \"standard\" audio signals to be directly connected. Digital matrix intercom systems from Riedel® can be effectively connected using the +6 dBu setting. And the +8 dBu setting allows proper level matching with the popular ADAM™-Series of matrix intercom systems from RTS. This setting also applies to the related RVON-I\/O VoIP product.\u003c\/p\u003e\u003cp\u003eThe Model 46A contains eight 5-segment LED level meters. Four of the meters are provided for each interface, with two displaying the level of the signal being received from the 4-wire source and two displaying the level being sent to the 4-wire output. During installation and setup the meters are invaluable in helping to confirm that the nominal level DIP switch settings have been properly made. During normal operation the meters offer rapid confirmation of audio signal flow in and out of the unit. Additional LED status indicators are also provided, offering a clear view of the 2-wire DC power and auto null functions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePro Audio Quality\u003c\/strong\u003e\u003cbr\u003e The Model 46A's audio circuitry was designed in the spirit of professional audio equipment, rather than that found in typical party-line intercom gear. High-performance components are used throughout, providing low-distortion, low-noise, and high headroom. Using passive and active filters, the frequency response is limited to approximately 100 Hz to 8 kHz. This range was selected to provide excellent performance for human speech, while maximizing the ability of the hybrids to create substantial \"nulls.\" When the Model 46A's internal DC power sources are selected to provide 2-wire party-line intercom power, enhanced audio performance can also be expected. The quality of the DC supply circuits is excellent, with very little noise, hum, or \"hiss\" being added to the 2-wire connections. In addition, the impedance characteristics of each interface's DC powered (\"wet\") channels was tailored to be essentially identical to that of the unpowered (\"dry\") channel. This unique situation allows the automatic nulling circuitry to provide excellent, consistent results for both the powered and unpowered channels.\u003c\/p\u003e\u003cp\u003eAttention to detail is a hallmark of the Model 46A's design. For example, during the brief auto nulling process an interface channel's 4-wire input and output signal is muted, preventing unwanted audio from reaching the connected equipment. Associated with the 2-wire interfaces is circuitry that, under software control, applies 200 ohm terminating impedances to the 2-wire party-line circuits. This, along with other circuitry that monitors DC voltages present on the 2-wire circuits, ensures that audio instability associated with unterminated circuits will rarely occur. As previously mentioned the Model 46A's 2-wire DC power sources offer a unique level of performance. Their ability to deliver power while maintaining audio quality is simply unmatched.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecial Applications\u003c\/strong\u003e\u003cbr\u003e While the Model 46A is designed to directly integrate into typical applications, it's ready to support the \"one-in-a-million\" situations, too. To accomplish this DIP switches, accessible on the back panel, allow some of the automatic features to be disabled. For example, one switch allows the auto-terminate feature to be disabled. While this feature can help maintain audio quality, advanced users might need to disable it. This would allow full control over the Model 46A's four hybrid circuits, enabling them to be used completely independently. A second DIP switch changes the way in which the front-panel auto null push button switches operate. Normally pressing one of the buttons begins the process of auto nulling both channels associated with an interface. The alternate switch mode allows each auto null sequence to be activated independently. One tap (a quick press and release) of the auto null button will begin the auto null process for channel 1. Two taps of the button will begin the auto null process for channel 2. For installer-selected applications, three opto-coupled inputs allow selected Model 46A features to be remotely controlled. These features include remote auto nulling for each interface and remote \"mic kill\" activation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSimple Installation\u003c\/strong\u003e\u003cbr\u003e The Model 46A uses standard 3-pin XLR connectors to allow convenient interconnection in most broadcast and general audio environments. For flexibility, access to the 2-wire party-line intercom interfaces can be made using the connectors provided on both the front and back panels. In permanent installations the back-panel connectors will typically be utilized. In other settings, such as field television production, front-panel-access allows intercom beltpacks to be rapidly connected, without requiring access to the inside of a rack enclosure or necessitating the use of a secondary input\/output (I\/O) panel.\u003c\/p\u003e\u003cp\u003eThe Model 46A is housed in a rugged aluminum and steel enclosure that is designed to be \"road tough.\" It mounts in one space of a standard 19-inch rack enclosure. The mains input source can range from 100 to 240 V, 50\/60 Hz allowing direct operation virtually anywhere in the world. A switch-mode power supply, contained within the Model 46A's enclosure, provides conversion of the mains input power into the DC voltage required by the intercom power supply circuits. Also contained within the unit is a DC-to-DC converter that creates the voltages required by the analog and digital circuitry. These efficient power supplies help to ensure cool, reliable operation in a variety of settings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDesign Philosophy\u003c\/strong\u003e\u003cbr\u003e While the \"bits and pieces\" that make up the Model 46A have been described in conventional terms, the real strength of the unit rests in how it integrates and performs in the \"real world.\" Before beginning the Model 46A's design process, conversations with industry experts quickly made it apparent that installing and configuring existing 2-wire-to-4-wire interface units was invariably a time-consuming, aggravating process that required the talent of an expert to achieve reasonable results. And even under those constraints the resulting audio performance was often mediocre. Any new design had to look at the application in a different way. This led to the over-riding Model 46A design goal: create a \"new breed of cat,\" fundamentally changing how broadcast 2-wire-to-4-wire interface equipment fit into actual applications.\u003c\/p\u003e\u003cp\u003eAn important first step was to eliminate the requirement that a senior technician, along with a screwdriver, be present during every installation. (It was universally acknowledged that their time can be better spent elsewhere!) The need to adjust trim potentiometers, fabricate special cabling and connector straps, use nulling earpieces, etc., had to be eliminated. For example, in virtually all instances, input and output levels fall within just a few dB of their nominal values and, as such, could be supported with a limited number of configurable choices. In addition, it was acknowledged that in this application analog audio circuitry was capable of providing excellent audio performance, but that the required manual nulling process was operationally taxing. By adding digital control to the analog circuitry, automatic nulling could be performed—the best of both worlds!\u003c\/p\u003e\u003cp\u003eThe next step was to identify resources that would improve the installation process and make operation more reliable. This led to the inclusion of multiple LED level meters, allowing continuous monitoring of the input and output signals. It also turned out that in many applications only a small number of user devices, such as beltpacks, are typically connected to 2-wire party-line circuits. By adding DC power sources to the Model 46A's 2-wire interfaces, the need for external intercom power supplies could often be eliminated.\u003c\/p\u003e\u003cp\u003eThe final step was to create a physical package that would provide significant resources in a form that allowed simple and reliable integration with other equipment. This was accomplished by including two 2-channel interfaces in a one-rack-space enclosure. Using standard 3-pin XLR audio connectors would enable rapid installation and troubleshooting. And by making the Model 46A \"universally\" powered, installation in any locale could be directly supported.\u003c\/p\u003e","brand":"Studio Technologies","offers":[{"title":"Default Title","offer_id":37756111953,"sku":"850217","price":2950.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1835\/6187\/files\/media_f4d1d01e-de88-4ba5-936d-8a9ed6397b07.jpg?v=1761303293"},{"product_id":"studio-technologies-model-47a-dual-2-wire-to-4-wire-intercom-interface","title":"Studio Technologies Model 47A Dual 2-Wire to 4-Wire Intercom Interface","description":"\u003cp\u003eThe Model 47A is designed to interface 2-wire full-duplex party-line (PL) intercom circuits with 4-wire audio circuits associated with matrix intercom systems. Other specialized audio system interfacing applications can also be supported. The Model 47A provides two independent full-featured 2-channel interfaces. Each interface contains two hybrid circuits which include automatic nulling capability. The analog circuitry, under software control, provides excellent audio quality and high return-loss. The interfaces are compatible with powered and unpowered 2-wire party-line circuits. They are capable of supplying DC power to devices such as user beltpacks and user stations. Independent power sources are provided for both channels (pins 2 and 3) of each interface, allowing direct support for broadcast source assignment panel (SAP) applications. Configuration settings allow the 2-wire and 4-wire interface circuitry to be compatible with a range of nominal signal levels. Audio level meters provide user confirmation of system performance during setup and operation. Applications for the Model 47A include mobile and fixed television facilities, theme park and theater installations, and industrial testing environments. Standard audio connectors are used for all input and output signals. The Model 47A mounts in one space (1U) of a standard 19-inch rack enclosure and requires 100-240 V, 50\/60 Hz for operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTwo 2-channel party-line intercom interfaces\u003c\/li\u003e\n\u003cli\u003eFour analog hybrids with auto null capability\u003c\/li\u003e\n\u003cli\u003eInput and output level metering\u003c\/li\u003e\n\u003cli\u003eExcellent audio quality\u003c\/li\u003e\n\u003cli\u003e2-channel intercom power sources\u003c\/li\u003e\n\u003cli\u003eDirect support for broadcast SAP panel applications\u003c\/li\u003e\n\u003cli\u003eStandard audio connectors\u003c\/li\u003e\n\u003cli\u003eUniversal input mains powered\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e The Model 47A's 2-wire interfaces are optimized for direct connection with 2-channel party-line intercom circuits. In addition, single-channel party-line intercom circuits can also be connected. Many broadcast applications use the 2-channel TW-Series from RTS®, including their popular BP325 beltpack. Other industry-standard single- and 2-channel PL intercom systems, including those from Clear-Com®, are also directly compatible. To provide optimal signal matching and interface performance the nominal level of the Model 47A's 2-wire interfaces can be selected. Using DIP switches, accessible on the front panel, the nominal levels can be selected to be either -10 or -14 dBu, settings that should allow compatibility with virtually all party-line systems.\u003c\/p\u003e\u003cp\u003eThe Model 47A's 2-wire interfaces can correctly function with powered (\"wet\") or unpowered (\"dry\") intercom circuits. Powered circuits have a DC voltage present, typically provided by power supplies such as the RTS PS20. This DC power, normally 30-32 V, provides energy for connected devices such as user stations or beltpacks. In this type of application the Model 47A is configured to operate in its external 2-wire power source mode. In this mode the Model 47A's circuitry maintains the required high-impedance load and, as in all cases, draws no power from the party-line circuit. An auto-terminate function ensures that should a \"wet\" circuit not be connected, the Model 47A's interface circuitry will remain stable. This unique feature makes certain that objectionable audio signals, including oscillations and \"squeals,\" will infrequently be sent to the connected 4-wire device.\u003c\/p\u003e\u003cp\u003eA significant capability of the Model 47A's 2-wire interfaces is their ability to supply DC power and 200 ohm AC termination to both channels (pins 2 and 3) of the connected intercom circuits. Referred to as the Model 47A's internal 2-wire power source mode, the 30 V outputs can power devices such as user stations and beltpacks. With independent power sources provided for both pins 2 and 3 of each interface, applications that include flexible party-line intercom channel routing will be directly supported. As such, in applications that include both source assignment panel (SAP) and Model 47A units the need for external intercom power supplies can be eliminated. Besides reducing total system cost, this capability may also lower system weight, reduce required mounting space, and decrease the mains energy requirements.\u003c\/p\u003e\u003cp\u003eWith the Model 47A's 2-wire interfaces able to supply up to 315 milliamperes (mA) of current on each channel, a typical broadcast application that uses four sets of three BP325 beltpacks can easily be supported. And the sophisticated 30 Vdc intercom power sources ensure that applications that require long intercom cable runs will function correctly. The circuitry's output regulation is such that little change in the output voltage will occur over its entire rated output current. Also, the unique design of the power supply circuitry virtually eliminates the noise and \"hiss\" associated with typical intercom power supply performance. Under software control each of the four DC power sources is monitored for over-current and short-circuit conditions. This allows protective shut-down of individual DC outputs, as well as providing an alert by way of a visual indicator.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAnalog Hybrids with Auto Nulling\u003c\/strong\u003e\u003cbr\u003e A key reason that the Model 47A's interfaces achieve excellent audio performance is the design of the 2-wire-to-4-wire hybrid circuits. They provide low noise and distortion, good frequency response, and high return-loss (\"nulling\"), even when presented with a wide range of 2-wire conditions. Unlike telephone-line (\"POTS\") oriented DSP-based hybrid circuits, the Model 47A's analog circuitry provides extended frequency response. With a pass band of 100 Hz on the low end and 8 kHz on the high end, natural-sounding voice signals can be sent to, and received from, the 2-wire party-line circuits.\u003c\/p\u003e\u003cp\u003eA hybrid's ability to isolate the transmit signal from the receive signal in the 2-wire-to-4-wire interface is critical. The quality of this isolation, technically known as return-loss or trans-hybrid loss, is measured in dB. A high value is important, especially in applications where multiple 2-wire-to-4-wire interfaces are used together. Remote sports broadcast applications are especially sensitive to this requirement. The Model 47A's sophisticated auto nulling function uses analog circuitry under microprocessor control to achieve significant trans-hybrid loss. This return-loss \"null\" is achieved by making a series of adjustments to account for the resistive, inductive, and capacitive conditions that are present on the connected 2-wire party-line circuit. A party-line's condition is the sum of the impact made by the type and quantity of cable, the connected user devices, and the intercom power source.\u003c\/p\u003e\u003cp\u003eWhenever a user presses one of the Model 47A's auto null buttons digital circuitry adjusts the analog hybrids to rapidly achieve their maximum return-loss. The nulling process takes less than ten seconds for each channel of an interface. However, it's important to note that while the nulling process is automatic, it only takes place upon user request. This can lead to more stable and consistent audio performance when a hybrid is exposed to the varying 2-wire conditions often found in broadcast applications. The parameters obtained during the nulling process are stored in non-volatile memory; mains power interruptions won't require the auto nulling function to again be performed.\u003c\/p\u003e\u003cp\u003eA sine-wave audio tone is generated for use during the auto nulling process. The frequency is software-controlled to maximize the ability of the hybrid circuits to reach a \"deep\" null. In addition, at the beginning of each auto null sequence a short period of 24 kHz tone is sent to the associated 2-wire party-line interface. This serves as a microphone disable (\"mic kill\") signal for user devices such as the RTS BP325. By automatically disabling \"open\" microphones the auto nulling process can achieve better performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e4-Wire Interfaces\u003c\/strong\u003e\u003cbr\u003e Associated with the 4-wire portion of the Model 47A's interfaces are analog line-level inputs and outputs. These are intended to interconnect with a variety of 4-wire devices, including matrix intercom systems, audio-over-fiber transmission systems, and other specialized audio equipment. The input and output circuitry is transformer-coupled to minimize the chance of hum, noise, or ground \"loop\" issues. A key characteristic of the Model 47A's design is the ability to select the 4-wire input and output nominal levels. This helps to ensure compatibility with virtually all audio equipment. Front-panel-accessible DIP switches allow the nominal levels to be configured from among four choices: 0, +4, +6, or +8 dBu. The 0 dBu setting was specifically provided for compatibility with Clear-Com matrix intercom systems. The +4 dBu setting allows \"standard\" audio signals to be directly connected. Digital matrix intercom systems from Riedel® can be effectively connected using the +6 dBu setting. And the +8 dBu setting allows proper level matching with the popular ADAM®-Series of matrix intercom systems from RTS. This setting also applies to the related RVON-I\/O VoIP product.\u003c\/p\u003e\u003cp\u003eThe Model 47A contains eight 5-segment LED level meters. Four of the meters are provided for each interface, with two displaying the level of the signal being received from the 4-wire source and two displaying the level being sent to the 4-wire output. During installation and setup the meters are invaluable in helping to confirm that the nominal level DIP switch settings have been properly made. During normal operation the meters offer rapid confirmation of audio signal flow in and out of the unit. Additional LED status indicators are also provided, offering a clear view of the 2-wire DC power and auto null functions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePro Audio Quality\u003c\/strong\u003e\u003cbr\u003e The Model 47A's audio circuitry was designed in the spirit of professional audio equipment, rather than that found in typical party-line intercom gear. High-performance components are used throughout, providing low-distortion, low-noise, and high headroom. Using passive and active filters, the frequency response is limited to approximately 100 Hz to 8 kHz. This range was selected to provide excellent performance for human speech, while maximizing the ability of the hybrids to create substantial \"nulls.\" When the Model 47A's internal DC power sources are selected to provide 2-wire party-line intercom power, enhanced audio performance can also be expected. The quality of the DC power sources is excellent, with very little noise, hum, or \"hiss\" being added to the 2-wire connections.\u003c\/p\u003e\u003cp\u003eAttention to detail is a hallmark of the Model 47A's design. For example, during the brief auto nulling process an interface channel's 4-wire input and output signal is muted, preventing unwanted audio from reaching the connected equipment. Associated with the 2-wire interfaces is circuitry that, under software control, applies 200 ohm terminating impedances to the 2-wire party-line circuits. This, along with other circuitry that monitors DC voltages present on the 2-wire circuits, ensures that audio instability associated with unterminated circuits will rarely occur. As previously mentioned the Model 47A's 2-wire DC power sources offer a unique level of performance. Their ability to deliver power while maintaining audio quality is simply unmatched.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecial Applications\u003c\/strong\u003e\u003cbr\u003e While the Model 47A is designed to directly integrate into typical applications, it's ready to support the \"one-in-a-million\" situations, too. To accomplish this DIP switches, accessible on the back panel, allow some of the automatic features to be disabled. For example, one DIP switch allows the auto-terminate feature to be disabled. While this feature can help maintain audio quality, advanced users might need to disable it. This would allow full control over the Model 47A's four hybrid circuits, enabling them to be used completely independently. A second DIP switch changes the way in which the front-panel auto null pushbutton switches operate. Normally pressing one of the buttons begins the process of auto nulling both channels associated with an interface. The alternate switch mode allows each auto null sequence to be activated independently. One tap (a quick press and release) of the auto null button will begin the auto null process for channel 1. Two taps of the button will begin the auto null process for channel 2. For installer-selected applications, three opto-coupled inputs allow selected Model 47A features to be remotely controlled. These features include remote auto nulling for each interface and remote \"mic kill\" activation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSimple Installation\u003c\/strong\u003e\u003cbr\u003e The Model 47A uses standard 3-pin XLR connectors to allow convenient interconnection in most broadcast and general audio environments. For flexibility, access to the 2-wire party-line intercom interfaces can be made using the connectors provided on both the front and back panels. In permanent installations the back-panel connectors will typically be utilized. In other settings, such as field television production, front-panel access allows intercom beltpacks to be rapidly connected, without requiring access to the inside of a rack enclosure or necessitating the use of a secondary input\/output (I\/O) panel.\u003c\/p\u003e\u003cp\u003eThe Model 47A is housed in a rugged aluminum and steel enclosure that is designed to be \"road tough.\" It mounts in one space (1U) of a standard 19-inch rack enclosure. The mains input source can range from 100 to 240 V, 50\/60 Hz allowing direct operation virtually anywhere in the world. A switch-mode power supply, contained within the Model 47A's enclosure, provides conversion of the mains input power into the DC voltage required by the party-line power supply circuits. Also contained within the unit is a DC-to-DC converter that creates the voltages required by the analog and digital circuitry. 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