Behringer-Micro HD-HD400-Hum-Destroyer-Behringer-HD400-P-Unless-you-re-setting-out-to-record-the-sound-of-bees-in-the-studio-or-on-the-stage-it-s-important-to-keep-AC-hum-out-of-the-mix-P-P-No-matter-the-quality-of-a-venue-s-wiring-the-Behringer-Micro HD-HD400-Hum-Destroyer-eliminates-hum-quickly-&-reliably-P-P-The-HD400-features-two-channels-which-can-eliminate-hum-in-two-mono-signals-or-one-stereo-signal-Try-putting-it-between-a-stereo-mixer-&-your-power-amps-for-a