The two button box has two push buttons on top. The left button marked talkback performs the same functions as the one button box. The additional button is a cough switch only. When it is depressed the mike is muted to the air circuit and the talkback circuit. Both the one button and two button boxes have 3 pin XLR connectors for the microphone input and 2 - 1/4" jacks for the headset ear piece. One jack is mono or interrupt only and one jack is stereo with interrupt audio in one ear and non interrupt audio in the other ear.
The "TALKBACK BOX" is designed to simplify the audio setup at the talent positions where talent talkback to the control room is required.
The single push-button on the top of the box removes the microphone from the air circuit and routes it to the talkback circuit.
The talkback circuitry in the box produces a line level (nom -10db) output that is transformer isolated to eliminate ground loops.
The "TALKBACK BOX" contains a complete 2 channel (Interrupted and Non Interrupted) RTS equivalent IFB station.
Power for the talkback circuitry is provided by the IFB station plugged into the box.
The AIR Microphone circuit is completely passive. If the power to an IFB station is lost , only the IFB and talkback functions will be lost - the air microphone circuit will still function normally.
The talkback output level is fixed at about -10db. This level, when fed into the line level input of a speaker amplifier should allow the amplifier gain pot to run about midrange. The level is low enough that no crosstalk problems should be experienced in bringing the talkback signal back down the mic level audio mult.
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