The Alto HPA4 4-Channel Stereo Headphone Amplifier is a professional headphone amplifier system for studio and stage applications. This universal, multi-purpose processor features 4 independent high-power stereo amplifiers in one rack unit, and delivers maximum audio quality - even at high volume levels. No studio should be with out the HPA4.
Four input/aux sections provide four mixes
Direct adjustable on the front panel for stereo signal source
Each channel has treble/bass controls
Each channel has output level control, mono/stereo switch, and left/right mute control.
Three headphone outputs on earch channel (one on front panel, two on rear panel)