PreSonus HP60 6 Channel Headphone Mixing SystemThe HP60 solves a host of common headphone monitoring problems. Each of its six headphone amps puts out 150 mW; if you can't hear this headphone system, you're stone deaf. Two global input channels and a Mix control let you adjust the click for each musician. Individual inputs let you send each musician a custom mix for "more me". Features: 6 screaming loud (150 mW channel) headphone amplifiers with level control 2 stereo input channels (A and B) with