SM Pro Audio HP6E - 6-channel headphone amp with 10x TRS inputs, 5x stereo channels, mix control for each amplifier output, 6x class A headphone amplifiers, 600mW nominal output per channel (@32 Ohms), 20Hz-20kHz frequency response @100mw output (+/-0.3dB), built-in flash memory for last state memory recall, built-in power supply. Dimensions: 19”/1U