Comm-Biner

The Comm-biner is a quality stereo audio interface that combines production and walkie talkie audio so both can be monitored via headphones. It is particularly suitable for reality and documentary production, but useful in any situation where walkies must be monitored as well as production audio.

The Comm-biner's standard stereo-mono switch allows for two modes of operation. In stereo mode, normal stereo monitoring of production audio with the comm feeds both channels; in mono mode, the stereo input is mixed to mono and fed only to a single mone earpiece. Additionally, the ring of the headphone jack is lifted so a mono earpiece will not short out the right channel feed. 

No need to block one ear with an uncomfortable surveillance tube, compromising the sound of your headphones in that ear. Both ears are open so you hear normally and the walkie talkie can be heard equally in both ears.

The Comm-biner can be used with any input source from professional mixer/recorder or camera to IFB receiver, iPod or iPad and feed to headphones, IEMs or earbuds. The signal chain is completely passive, so no power is needed.

A transducer and tube are included for times when use of surveillance is preferred.

Instructions for standard operation:

1. Plug the mini to mini plug cable into the audio source and into the PGM input of the Comm-biner. Do not plug a mono mini plug into a camera headphone jack; it grounds the right channel output and may damage it. 
2. Plug the walkie talkie cable mini plug into the WT input of the Comm-biner.
3. Set the ST-M DIP switch as needed for either standard stereo monitoring or mono monitoring using a ballpoint pen or small screwdriver blade (normal operation is stereo; mono is for use with a single earpiece).
4. Set the desired walkie feed to either Left, Right or both channels using the L and R DIP switches.
5. Plug the headphones into the PHONES output.
6. Adjust the level of the walkie talkie audio to program audio with the walkie volume control.