PreSonus HP4 4-Channel Headphone Distribution Amplifier

The PreSonus HP4 is a professional headphone distribution amplifier designed to provide clean, powerful audio monitoring for multiple listeners simultaneously. It serves as a central hub for headphone monitoring in recording studios, rehearsal spaces, and live sound environments, allowing up to four people to listen to the same audio source with individual volume control. The unit takes stereo line-level inputs and distributes the signal to four discrete headphone outputs while maintaining signal integrity. The HP4 features four independent ¼-inch headphone outputs on the front panel, each delivering 150mW of amplification per channel—providing ample volume for even demanding monitoring situations. Each channel has its own dedicated volume potentiometer, allowing users to set their preferred listening levels independently. The rear panel includes balanced ¼-inch TRS line inputs and outputs, with the monitor outputs featuring their own level control, mute switch, and mono summing capability. This allows the main monitor speakers to be muted while headphones remain active, which is particularly useful during recording sessions. The compact steel and aluminium chassis is designed for desktop use or can be mounted in a standard equipment rack using just one-third of a rack unit's space. This amplifier is ideal for home studios, project studios, and small professional facilities where multiple musicians or engineers need to monitor the same mix. Its daisy-chain capability via the monitor outputs means systems can be expanded by connecting additional HP4 units or larger PreSonus HP60 amplifiers as needs grow. The sealed, detented metal controls ensure durability and precise adjustment, while the external 16VAC power supply provides clean, stable operation. With its combination of robust construction, straightforward operation, and professional-grade specifications, the HP4 offers a reliable and versatile solution for headphone monitoring in various audio production scenarios.