Nady HE-1 Hum Eliminator: * Easily eliminates AC hum (60Hz/120Hz buzz) with up to 20dB of attenuation * Breaks grounds loops safely while leaving all signal grounds intact * Converts automatically back and forth between balanced and unbalanced lines at either end * 1/4" unbalanced and XLR balanced outputs * Dual channel I/O with 1/4" TRS jacks * Completely passive design with quality components assures best possible noise * Distortion-free performance