Behringer Microhd Hd400 Hum DestroyerThe HD400 is the ultra affordable way to quickly and easily clean up your act! Whether youre recording or performing, its important to keep AC hum out of the mix. No matter the quality of the venues wiring, the MICROHD HD400 Hum Destroyer eliminates AC hum quickly and reliably. The HD400 features two channels allowing you to eliminate hum in two mono signals or one stereo signal. Placing the HD400 in line between your stereo mixer and power amps for a