The CM-TB8 is a powerful and highly flexible self contained communications unit allowing multiple 4-wires and IFBs within a single 1U rack space. It offers easy connection to any industry standard talkback system including the Sonifex CM-TLL line listen unit, the CM-BHA and CM-BH4W belt-packs plus the CM-CU1 and CM-CU21 commentator units. The CM-TB8 8 Channel Talkback Control Unit is ideal in an OB truck or small studio. The unit has individual connections for both a headset on 5 pin XLR and microphone/headphones on XLR/stereo TRS jack, with the current selection indicated on the front panel. The gain setting for each input type can be individually set between +6dB and +68dB allowing for a wide range of microphone types and +48V phantom power is also available. Small talk level adjustments can be made quickly, using the front panel rotary control with a maximum adjustment range of ±12dB. This adjustment can be disabled if required to stop inadvertent changes. A level limiter automatically adjusts the microphone gain if the signal level exceeds a preset level, and the current talk level is indicated on the front panel when it exceeds 0dB and +8dB. A separate output on the rear panel provides a balanced, gain adjusted and level limited microphone signal on 3 pin XLR.
Product Features
8 Channel talkback control unit in a 1U rack mount package.
Separate microphone and headset inputs with phantom power and individual gain settings.
Microphone talk level can be instantly adjusted or preset.
Talk level LEDs and built-in limiter.
Configurable ‘Group Talk’ function.
Interruptible Foldback and direct 4-Wire operation selectable on each channel with optional talkback-microphone mix function.
2 external IFB (Interruptible Foldback) inputs available to each channel.
Optional telephone hybrid or GSM ports allow direct connection to a telephone line for remote communications.
Individual monitor level control for each channel.
Microphone output feed which is gain adjusted & level limited.
Ethernet connection for remote configuration with built-in web server.
6 stored configuration templates with 4 user editable sets.
Front panel loudspeaker with separate feed for an external loudspeaker.
Loudspeaker mute and dim controls, also available on remote input.
Remote ‘tally’ outputs indicating when each channel is active.
Remote inputs providing a call indication on each channel.
Built in tone generator for channel identification.
Typical Applications
Ideal in an OB van/truck or small production gallery where talkback is needed between up to 8 different areas/groups, which could be commentators, cameramen, presenters, etc.
Product Category
Talkback, Intercom & Control
Technical Specifications
Microphone Input
Gain Range: +6dB to +68dB
Maximum Input Level: -6dBu
C.M.R.R.: >60dB
Frequency Response: ±0.5dB 20Hz to 15kHz Ref 50dB gain @ 1kHz
Headphone Output
Gain Range: -60dB to +18dB
Maximum Output Level: +18dBu
Frequency Response: ±0.5dB 20Hz to 15kHz
4-Wire And IFB Inputs
Maximum Input Level: +18dBu
Frequency Response: ±1dB 20Hz to 15kHz
Talkback Outputs
Maximum Output Level: +18dBu
Frequency Response: ±1dB 20Hz to 15kHz
Loudspeaker
Power Output: 6W
Noise: More than 80dB below full output
Volume: Mute to full volume via front panel potentiometer
