Bosch CCS-CUD-US Control Unit with DAFS Feedback Suppression


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  • The Control Unit (CU) is the heart of the CCS Ultro Discussion System and supplies the power for all delegate and chairman units in the system. The unit also controls the chairman and delegate unit microphones, as well as providing connections for audio inputs and outputs.

    CCS‑CU Control Unit

    • Digital Acoustic Feedback Suppression
    • Discussion control without operator
    • Controls up to 150 contribution devices
    • Built-in monitor loudspeaker
    Digital acoustic feedback suppression

    The digital acoustic feedback suppression facility automatically eliminates acoustic feedback (also known as ‘howling’ or ‘Larsen effect’). This gives better speech intelligibility by allowing the speaker volume to be turned up as loud as required without any risk of feedback. Discussion control without operator The CU can be setup to operate standalone without the need for an operator. The following 5 modes can be chosen using a rotary control on the unit’s top panel:
    • Open mode – allows selection of one to four microphones (excluded chairmen microphones) which can be simultaneously active
    • Open mode with auto-switch-off – allows selection of one to four microphones (excluded chairmen microphones) which can be simultaneously active. If the delegate does not speak for 30 seconds, microphones are automatically switched off
    • Override mode – delegates can override each other simply by activating their microphones. Only one microphone can be active at any one time. (Note: In override mode, delegates cannot override chairmen)
    • Chairman only mode – only chairmen can speak. Delegate microphones cannot be activated, even when a chairman is not speaking
    • Test mode –checks if system connections are correct. All microphone light rings and contribution unit LEDs light up to indicate that units are properly connected
    Supplies power for up to 50 contribution units
    The CU has two trunk outputs for the loop-through connection of contribution units. It is possible to connect 25 contribution units to each trunk output, with a maximum system cable length of 100 m (109.3 yards).
    Provides control for up to 150 contribution units Up to 3 CUs can be used together in a discussion system to power and control a maximum of 150 contribution units. In this configuration a single CU acts as a master controller for the entire system. Built-in monitor loudspeaker
    The built-in monitor loudspeaker and headphone socket allow the conference to be monitored. The following equipment can be interfaced to the CCS Ultro Discussion System through the CU:
    • External wired or wireless microphone – for guest speakers or audience participation. (Note: The external microphone is muted when the priority button on a chairman unit is pressed, and when the system is operating in ‘chairman only’ mode)
    • External PA system – for transmitting the proceedings to an audience in the same room or an adjacent room
    • Tape recorder – for external recording and playing back meetings and discussions
    • Audio equipment – for providing background music
    • Telephone coupler – to allow a remote delegate to participate via telephone
    • External audio processing – an insertion connector is provided
    Controls and Indicators:

    • Mains on/off switch
    • Loudspeaker volume control, for setting output level of loudspeakers of contribution units. This control also determines the maximum level for the headphone outputs of the contribution units and the CU.
    • Microphone mode rotary switch, for setting the number of simultaneously active microphones, and selecting one of the four operation modes (plus test mode)
    • Power on LED
    • On/off switch for digital acoustic feedback suppression facility
    • Microphone input gain adjustment
    • External recorder input gain adjustment
    • Insertion connector bypass switch
    • Interconnections
    • 1 x 3.5 mm (0.14 inch) stereo headphone socket
    • 1 x AC input
    • 2 x 7-pole circular female connectors, trunk in/out loop through interconnection
    • 1 x 3-pole female XLR connector, microphone input (can be used as line input by included 50dB attenuator)
    • 1 x Cinch connector pair, line input/output
    • 1 x Cinch connector pair, telephone input/output
    • 1 x Cinch connector pair, insertion input/output
    • 2 x Cinch connector pairs (R/L channel), external recorder input/output
  • Electrical
    Mains voltage  100 to 240 VAC ± 10 %
    Current Consumption maximum 0.9 A (100 VAC) to 0.3 A (240 VAC)
    DC supply to contribution units 24 V ± 1 V (current limited)
    Loudspeaker volume control mute (50 dB att.) + 10 steps of 1.9 dB
    Limiter threshold level to unit 10 dB above nominal level loudspeaker / headphone
    Gain reduction due to number of open microphones (NOM) ÷ NOM ± 1 dB
    Total harmonics
    Nominal input (85 dB SPL) < 0.5
    Max. input (110 dB SPL) < 0.5
    Sample frequency (CCS‑CURD)
    Recording 32 kHz
    Playback 32, 44.1, 48 kHz
    Bit rate (CCS‑CURD)
    Recording 64, 96, 128, 192, 256 KBit/sec
    Playback any bitrate
    Compatible conform ID3V2 mp3-tags (CCS‑CURD)
    Memory card Any SD Card up to 2 Gb (high speed cards advised)
    Recording capacity (CCS‑CURD)
    Internal memory Card size
    Bit rate 225 MB 512 MB 1 GB 2 GB
    64 07 h : 41 m 17 h : 14 m 34 h : 28 m 64 h : 56 m
    96 05 h : 07 m 11 h : 29 m 22 h : 59 m 45 h : 58 m
    128 03 h : 50 m 08 h : 37 m 17 h : 14 m 34 h : 28 m
    192 02 h : 33 m 05 h : 44 m 11 h : 29 m 22 h : 58 m
    256 01 h : 55 m 04 h : 18 m 08 h : 37 m 17 h : 14 m
    Dimensions including feet (H x W x D) 84 x 361 x 143 mm (3.4 x 14.2 x 5.6 in)
    Height of feet  5.5 mm (0.22 in)
    Mounting tabletop (portable or fixed)
    19-inch rack
    flush mounting
    Weight 1.5 kg (3.3 lb)
    Material  (top) polymer
    Material (base) painted metal
    Color (top) charcoal(PH10736)
    Color (base) black(PH80007)
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