We have always used microphones for our instruments and seldom have trouble with feedback. However, on one occasion we had intermittent feedback that seemed to deify our best attempts to eliminate the problem. The room had large flat surfaces which never seem to help. We adjusted the equalizer, volumn controls, monitors, etc. and every time we thought we had the problem solved we would get feedback again. Finally someone noticed that the problem occured every time someone came in through the door and passed in front of the speaker. We elevated the speaker to about six feet and solved the problem. Since that time we always try to elevate the speakers as much as possible and this seems to reduce feedback problems.

GOOD LUCK Cap't Bob