Free 31-band Tones for Reference

I created these tones as a reference for live sound engineers who need a little help finding and remembering those pesky feedback frequencies. Broken down by the frequencies you'd find on on a 31-band EQ, the frequencies below 50 Hz are sine waves, and the rest are squared sine waves up to about 10,000 Hz (10 kHz), above that the tones go back to being sine waves. The choice to make the tone a sine wave or a squared sine wave was purely aesthetic on my part.

Be really careful sampling frequencies below 50 Hz, because if you don't have speakers that can push that low, it's going to sound really bad and might send your speakers into a tizzy. If you can't hear the frequencies above 16 kHz, your speakers might not push that high or you've got hearing loss similar to mine.

Frequency tones are encoded in MP3 at 160 kbs, peaking at -3 dBs. Click the link below, click "continue," then click "download" for the free 6.4 MB download and unzip.

Free 31-Band Reference Tones Download