ART HQ231 Dual 31-Band Equalizer with Feedback Finder

The newest member of the HQ Series, HQ 231, features ART's FDC Feedback Detection Circuitry.

The ART proprietary FDC differs from similar systems in that it is extremely fast.

Although it illuminates the band with the greatest energy with the brightest LED, it doesn't fully discriminate between bands and will not get "stuck" on one band when there is no signal.