For systems with multiple microphones, configure feedback suppressors on the mic or line inputs that need control, and assign additional suppressors to output channels serving separate zones or loudspeaker paths. Use the mixer’s routing matrix to match each input with its intended outputs, then set gain, equalization, and acoustic echo cancellation before fine-tuning suppression for the active microphones and zones.

When choosing feedback suppressors, compare the number of suppression filters, whether they can be assigned to microphone inputs and output channels, and how they work with built-in equalization, compression, acoustic echo cancellation, or automatic gain control. Also consider the room’s microphone count, mixer or amplifier signal paths, control method, and installation needs across conference rooms, classrooms, commercial spaces, and public facilities.

Feedback suppressors in digital mixers detect recurring microphone-to-speaker feedback frequencies and reduce them with targeted filtering, while automatic mixing manages microphone levels and routing to help limit unnecessary open channels. Acoustic echo cancellation addresses reflected far-end audio in conferencing systems, and equalization shapes the system’s frequency response, so each function supports feedback control without replacing the others.

Feedback suppressor performance depends on microphone and speaker placement, with microphones positioned away from the main speaker coverage and speakers aimed toward the audience rather than directly at microphones to reduce acoustic coupling. Set gain structure so input and output levels provide usable headroom without excessive amplification, then account for room acoustics such as hard reflective surfaces, room size, and reverberation when adjusting equalization, speaker coverage, and suppressor settings.