4-Wire Talkback Unit

The C1B is a compact battery-powered 4-wire box for headset use only. Selectable operating modes suit various applications in a number of studio and outside broadcast situations where 4-wire communications are used.

C1B front panel view
  • Three user-selectable operating modes:-
  • 4-wire mode.
  • Interrupted loop-through mode with input monitoring.
  • 2-wire Conference mode.
  • 9 volt battery powered with very low current drain (2mA).
  • Microphone limiter to maintain peak output at +8dBU.
  • Auxiliary audio monitoring input on unbalanced 3.5mm jack.
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