PreSonus HP4 4 Channel Headphone AmplifierTired of straining to hear the headphones? The HP4's four 130 mW headphone outputs are clear, clean, and screaming loud, all packed in a compact, 1 3U chassis. Features include balanced L R line inputs and outputs, global mute, overall level control, and sum to mono. The line outputs can feed another HP4 or an HP60. Features: 4 screaming loud (130 mW per channel) stereo headphone amps 2 balanced 1 4" line inputs Headphone level control Mono summing

Selectable display mode showing group/channel

6 C batteries (14 hrs)

For clear display of your mix

Individually adjustable to all head sizes

single or dual rack-space design

and 2 channels of digital USB playback for a total of 24 channels

NTSC or PAL

Symmetrical transducer with 2 backplates providing extremly low distortion

If the input level is increased so that the compressor is active

Document of Warranty

articulated gain control

Slate tone functions (automatic/manual)