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.
- 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.
| Microphone Input / Line Output Amplifier | |
| Input Impedance | Unbalanced for 200 ohm dynamic microphone |
| Microphone Connector | 6.35mm (A-gauge) headset jack. Ring input, sleeve gnd |
| Limiter Input Threshold | -62dBU |
| Line Output Level | +8dBU peak (battery voltage > 6V) |
| Output Impedance | 150 ohms, transformer coupled |
| Line Connector | XLR3M |
| Line Input / Headphone Amplifier | |
| Line Input Impedance | 10k ohms, transformer coupled |
| Line Input Connector | XLR3F |
| Gain Range | +10dB to off |
| Auxiliary Input Impedance | Unbalanced high impedance |
| Auxiliary Input Connector | 3.5mm jack |
| Gain | +8dBU |
| Maximum Output Level | 30mW in 100 ohm load (minimum load impedance) |
| Headphone Connector | 6.35mm (A-gauge) headset jack. Tip output, sleeve gnd |
| 2-Wire Mode | |
| Line impedance: 10k ohms (listen), 600 ohms (talk) | |
| Power Supply | |
| Power | PP3 9V battery (in drawer), current 2mA. LED low voltage warning at 6V |
| Physical | |
| Dimensions | W65mm H40mm D150mm |
| Weight | 375g |
| Finish | Diecast metal with light grey and black finish |
