Morley Ebtech Hum Eliminator 2 XLR, 2-Channel Hum Eliminator with XLR-Connectors, eliminates AC-Humming and und prevents Humming Loops, grounding stays intact, passive working (no Power Supply needed), Range: 20Hz up to 70kHz +/- 0,5dB, less than 0,005% THD @ 1kHz, Crosstalk less than -97 dB, max. Input Impedance 1 kOhm, min. Load Impedance 10kOhm, Dimensions WHD: 3,5" x 4,75" x 1,5" (B x H x T), Made in USA