Presonus HP4 4-Channel Headphone Amplifier Pro Tools Now we've extended it to

Now we've extended it to 33 frequencies in 3 bands with 6 new frequencies from 20 Hz to 150 Hz

which may cause stress on the PC board assembly while the outside bookend cover provides a protective zone for the switches

accurate sound reproduction

plus the ability to easily dial-in your own signature sound

Presonus HP4 4-Channel Headphone Amplifier Pro Tools Now we've extended it toPresonus HP4 4 Channel Headphone Amplifier The HP4 from PreSonus answers the need for a headphone distribution amplifier with professional specifications in a small package at an affordable price. The HP4 features four discrete headphone outputs on the front panel each with its own volume potentiometer and 150mW of amplification per channel. The HP4 also features adjustment over control room monitors with a separate volume control, monitor mute switch