Feedback Finder
Find the ringing frequency
Frequencies to cut
Nothing found yet. Each ringing frequency is added here, with the graphic EQ slider to pull down.
About the Feedback Finder
When a microphone starts to ring or squeal, this tells you exactly where. It listens through your phone's or laptop's microphone, draws a live high-resolution spectrum, and watches for the narrow, steady peaks that feedback makes. When one holds long enough, it shows the frequency, the nearest slider on a 31-band graphic EQ and a suggested parametric cut, and adds it to a list, so you can ring out a whole system one frequency at a time. It's built for volunteers running sound at church, school and small venues. The Demo shows it catching two rings without a microphone.
- Press Start and allow the microphone. Put your device near the speakers or the mic that's ringing.
- Ringing out: with no music playing, slowly raise the mic or monitor gain until a tone just starts to ring.
- Cut the frequency it shows on the graphic EQ (or a narrow parametric cut), then raise the gain again for the next one.
- Stop after three or four cuts: more than that and the mic will start to sound thin.
Frequently asked
What is ringing out a system?
Finding the frequencies where a microphone and speakers start to feed back, and cutting them slightly on an EQ before the service, so you get more volume before feedback. You raise the gain slowly with nobody speaking, catch each ring as it starts, and cut it.
How much should I cut?
Start with 3 to 6 dB, with a narrow width (Q 8 to 10) on a parametric EQ, or by pulling the one slider down on a graphic EQ. Deep, wide cuts make voices sound thin.
Can it hear feedback while music is playing?
Yes, but sustained notes and hum can look like rings too, so it works best during sound check or while ringing out with the system quiet. Low sensitivity ignores most music.
Is this an SPL meter?
No. The level shows dBFS (relative to the microphone's full scale), which depends on the device. Use it to compare, not as an exact sound level.
Is my audio recorded?
No. The sound is analysed live in your browser and never recorded or uploaded.
Is what I type sent to a server?
No. The tool runs entirely in your browser and there's no server behind it, so what you type never leaves your device and nothing is stored. You can check: it keeps working if you go offline after the page has loaded.
More from the Music drawer
Other tools kept in this drawer, plus a few favourites from the bench.