The THS 4 Talkback/Headphone box is an all-purpose, fully loaded sports announcer console. Both main and talkback microphone outputs are provided, with Mic On/Off, Cough and Talkback switches for control. The talkback output is line level with a trim control and the main microphone output of the THS 4 will be live on-air if power is lost, when using dynamic microphones.
There are two inputs for the headphones with balanced and unbalanced connections.Each input has a volume control and assign switches for the left and/or right headphones. Input level adjustments affect both left and right ears equally. Headphones with impedances ranging from 30 to 600 Ohms can be driven to full volume.
The THS 4 has both main and talkback microphone outputs. A latching Mic On/Off switch connects signal to the main mic output. The switch is illuminated red when the mic output is live. 36 Volt phantom power is available if condenser mics are used. Onboard phantom power allows seamless switching when talkback is activated. The switch to turn phantom power on and off is recessed to avoid accidental turn off. A momentary Cough switch silences both the mic out and the talkback out when depressed. The momentary Talkback switch connects audio to the talkback output and mutes the mic out. The announcer's microphone is sent through a preamp and line driver that deliver signal to the talkback output at line level. There is a level control for fine adjustment of the audio sent down the talkback line. The Talkback switch illuminates green when depressed.
The headphone section of the THS 4 has two inputs. Each input has a volume control and dip switches to send the signal to the left and/or right headphone earpieces. When an input is assigned to both ears, level adjustments affect both left and right ears equally. Input signals can be either balanced mono or unbalanced stereo. A rear panel switch selects the proper mode. Both 3 pin XLR and 1/4" TRS input jacks are provided for hookup flexibility. Headphones with impedances ranging from 30 to 600 Ohms can be driven to full volume.
Power is supplied by a 12 VAC power adapter, model # PS12AC1A, included with the unit.