Sonifex Mix-Minus Generator

This Mix-Minus Generator from Sonifex is a unit for generating a suitable mix to send to a telephone hybrid or codec. Most telephone lines incur delays, which prohibit off-air monitoring, because the caller, or remote talent, would hear their own voice in delay, which is very disconcerting. The solution is to feed a mix back to the caller minus his or her own voice. Some mixing desks do not have a dedicated telco channel to generate clean-feed, or mix-minus, so the Mix-Minus Generator can be used. A band-pass filter can be switched in and out, via a rear-panel switch, to condition the signal for the telephone hybrid.