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Oxmoor DCA-2T Digital Control Attenuator (Core Unit)


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  • The DCA-2T is a sleek, rack-mountable box that provides control of two discrete audio channels (90 dB of isolation provided for two unrelated programs), or control of a single stereo program.

    Multiple DCA-2Ts can be linked together to provide up to 64 discrete channels. The DCA-2T features user-assigned preset levels to control the amount of attenuation at power up, eliminating unpredictable or unknown turn-on state, as well as a priority function to set a temporary system level upon a switch closure, ideal for fire alarm or paging applications.The DCA-2T features electronically balanced inputs and balanced transformer-isolated outputs, with XLR connectors. It is used with the Oxmoor RC-16 remote volume control and requires one rack space.

    Precise volume control can be provided at as many locations as required with the optional RC-16 remote controls. They are easily wired and linked together using simple RJ-11 modular telephone cables. Up to four RC-16 remotes can be connected to a given control input. There are 29 steps of precise 1.5 dB attenuation from 0 to -43 dB, with a 30th step for 90 dB "full kill" attenuation.

    The optional RC-16 is actually a highly sophisticated shaft encoder which translates knob movement into a string of digital pulses. Unlike standard "Up and Down" volume controls, the RC-16 is sensitive to rate of change between steps – so the faster the knob is turned, the faster the setting is changed. As any interconnected RC-16 knob is turned, the LEDs on all remotes in the chain follow until the upper or lower limit is reached. At that point, the knob will continue to turn, but the level and Virtual Pointers simply stop changing until any one of the knobs is turned in the opposite direction. Since there are no mechanical stops, a knob cannot be "twisted off" if it is turned beyond what would be the stop positions on a conventional level control.

  • Frequency Response
    20 Hz to 20 kHz
    -3 dB Points, Ref. 1 kHz
    +0, -0.3 dB
    4 Hz to 60 kHz (+4 dBm Output)
    Hum and Noise
    Unweighted -80 dB (ref. 0 dBm output @ unity gain)
    Ref. +4 dBm Output @ Unity Gain
    THD + Noise0.002% (20 Hz to 20 kHz BW)
    SMPTE IMD0.002% (60 Hz + 7 kHz, Mixed 4:1)
    Transient Intermodulation0.004% (3.15 kHz SQ + 15 kHz Probe, 30 kHz BW)
    Channel to Channel (20 Hz to 20 kHz, Input Terminated w/600 Ohms, Adjacent Channel Driven to 0 dBm)-90 dB
    Audio Input
    TypeElectronically Balanced (RF Suppressed)
    ConnectorFemale XLR
    Pin Out Pin 1 Shield (Chassis)Pin 2 +, Pin 3 –
    Input Impedance80 k Ohms
    Nominal Input Level+0 dBu
    Maximum Input Level+20 dBu
    Trim Pot Gain Range ±15 dB (Ref. 0 dBu Output)
    Audio Output
    TypeBalanced, Transformer-isolated
    ConnectorMale XLR
    Pin OutPin 1 (Chassis), Pin 2 +, Pin 3 Shield
    Source Impedance75 Ohms
    Recommended Load Impedance600 Ohms or Greater
    Nominal Output Level 0 dBu
    Maximum Output Level Ref. 1 kHz @ Rated THD
    Terminated w/600 Ohms+18 dBm (All Outputs Driven Simultaneously)
    Unterminated +20 dBu
    Digital Attenuator
    Control Range 0 to -43.5 dB in 29 Steps Plus a 90 dB Full Attenuation "Kill" Step
    Tracking Accuracy (Ch. to Ch.)Within ±0.1 dB Throughout Attenuator Range
    Preset and Priority Range15 Steps (of 3 dB each) Plus "Kill"
    Control Loop
    Maximum Controls Per Channel 4
    Maximum Channels Per Control Loop64
    Maximum Cable Length600m (2000 ft)1
    Contact RequirementsSingle Pole Switch or Open Collector Transistor (128 mA capacity), Dry Closure to Logic Ground
    Wiring Scheme Daisy-Chained Connection Via Looping Jacks
    Cable and Connectors6-Wire Modular Telephone type RJ-11/12
    Safety Listing City Of Los Angeles
    Mains Power
    Power Requirements100 to 125 VAC or 200 to 230 VAC 50/60 Hz; 8 Watts Maximum
    Overall Dimensions44H x 482W x 183D mm
    (1.72 H x 19 W x 7.18 D in)
    Finish Textured Black Paint
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