You know the sound, a low hum that turns into a rumble that turns into a roar or a voice that sounds like it’s in a tin can and then the all-too-familiar high-pitched squeal that kills your hearing; that’s right, I’m talking about feedback.
It’s the bane of every board operator in every church, in every venue, at every event and it’s been prime enemy number one since live sound first came about. The basic premise is that the microphone is picking up the sound from a monitor or the house speakers and this creates a feedback loop. It’s the acoustical equivalent of standing in between two mirrors and seeing yourself replicated into infinity. It’s not a good problem to have and there are two primary ways of combating it.