What causes feedback and how do I stop it?
Quick answer
Feedback occurs when a microphone picks up sound from a loudspeaker and re-amplifies it, creating a loop. To stop it, reduce gain, reposition microphones, or use EQ to cut resonant frequencies.
Feedback is caused by an acoustic loop: sound from a loudspeaker enters a microphone, gets amplified again, and repeats, building into a howl or screech. This typically happens when the microphone is too close to the speaker, the gain is too high, or the room has reflective surfaces that reinforce certain frequencies.
To stop feedback, first lower the gain or volume of the offending channel. Reposition microphones so they are behind the loudspeakers (pointing away from them) and closer to the sound source. Use a graphic or parametric EQ to identify and cut the feedback frequency by 3–6 dB. SSOUNDS systems include advanced DSP with feedback suppression tools to help manage this automatically.
In live sound, proper system tuning is critical. Use a measurement microphone and software to ring out the room before the event. SSOUNDS line arrays and point-source speakers are designed for controlled coverage, reducing spill into microphones and minimizing feedback risk. Training your team on mic technique and monitor placement also prevents issues.
Key things to consider
- Feedback is a loop from speaker to microphone and back.
- Lower gain or volume immediately to stop feedback.
- Move microphones behind speakers and closer to sources.
- Use EQ to cut the specific feedback frequency.
- SSOUNDS DSP and controlled-coverage speakers help prevent feedback.
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