PreSonus HP60 6-channel Headphone Amp with Independent Mix Control and 1 Year Free Extended Warranty 1U 19 rack-mountable, rugged steel chassis Internal power supply with standard IEC connector 6 screaming-loud (150 mW/channel) headphone outputs (front panel) 6 unbalanced stereo  line outputs (1 per channel); carries a copy of the channel mix 6 unbalanced stereo  external analog line inputs (1 per channel) for more me, with trim controls