4-channel stereo headphone distribution amplifier Four independent 1/4″ stereo headphone channels Individual volume control on each headphone channel Two balanced 1/4″ input connectors Stereo 1/8″ Aux input and output Master Mute and Mono-summing switches Specifications Inputs: 2 x 1/4″ balanced, stereo 1/8″ unbalanced TRS Outputs: 4 x stereo 1/4″ unbalanced, stereo 1/8″ unbalanced TRS Controls: Master volume, master Mute, master Mono, 4 x Channel volume Noise Floor: -114dBu, 22k BW unweighted Maximum Output: 8.3 dBu, 1% THD+N, loaded 16R Output Power: 282mW per side / 564mW per channel, loaded 32Ω Dynamic Range: 22dB, 22k BW Frequency Response: 17Hz–47kHz (-3dB) Power: 15VDC adapter