The THS-2 Talkback Headphone BOX from Whirlwind is configured with a microphone on/off switch and a momentary cough switch to control the output of a microphone. The microphone output of the box is a passive, straight through connection from the microphone input. This ensures that the microphone will still be live on-air, even if power to the THS 2 box is lost. The THS-2 allows phantom power to be supplied to a condenser microphone through the microphone output from the broadcast audio mixer (not included).
Headphone inputs consist of balanced left and right inputs on separate female XLR connectors. A single front panel volume control adjusts the level of both the left and right earpieces along with another aux input which feeds left and right ears equally. The Aux input has its own volume control. Headphones with impedances ranging from 30 to 600 ohms can be driven to full volume.