headphone amplifier 120V Rail headphone amplifier, preamplifier and monitor controllerFor all headphones with impedances >10Ohms (>40Ohms for balanced headphones)Innovative Phonitor Matrix: speaker-equivalent listening on headphonesLaterality control: super-fine balance controlSolo LR, Polarity LR, MonoStereoVolume remotely adjustable (learns any IR remote control)Maximum output power: 2 x 2W (1kHz300Ohm)Frequency response: 4Hz - 480kHz (-3dB)THD+N: 0.00091% (HP), 0.00085% (Line)Dynamic range: 133.62dB (HP), 134.37dB (Line)