Behringer MICROHD Hum Destroyer HD400

The HD400 features two channels that can eliminate hum in two mono signals or one stereo signal. Try putting it between a stereo mixer and your power amps for a sound free of AC hum. It breaks ground loops safely while maintaining the highest sound quality... Ultra-Compact 2-Channel Hum Destroyer. Removes AC hum and noise - fast, easy and reliablelity. Automatically converts unbalanced to bala...