PreSonus HD9/HP4 Pack 4-Channel Headphone Amplifier with 4 Closed-Back Headphones

The PreSonus HD9/HP4 Pack is an HP4 4-channel headphone amplifier with four HD9 closed-back headphones, and is designed to deliver personal monitoring for up to four musicians, artists, or podcast guests in home, project, or commercial studios. The foldable, rotatable headphones utilize 45mm neodymium drivers to produce a frequency response of 10 Hz to 26 kHz.

Connect them to the high-power, front-panel 1/4" headphone outputs of the HP4, which also offers left and right 1/4" output jacks for connection to studio monitors. The headphone amp accepts a stereo feed via 1/4" inputs and features an adjustable headphone level per channel, switchable mono/stereo operation, adjustable monitor level, and a monitor mute switch.