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Headphone Amplifier PreSonus HP4 120 W Peak Power 0.0025% THD
The PreSonus HP4 headphone amplifier delivers high peak output and low distortion for accurate monitoring and personal listening. With 120 W peak power per channel and a specified total harmonic distortion of 0.0025%, the HP4 is designed to drive a range of headphones with clean, wide dynamic-range sound. The compact chassis in blue is suitable for desktop use or screw-mounting to a standard rack tray, occupying approximately one-third of a rack space. Stereo left and right line inputs and outputs, four headphone outputs, summing-to-mono capability and individual level controls enable flexible routing and level management for session and stage workflows.
The unit combines high peak power with very low THD to maintain clarity at elevated levels while its input impedance of 10 Ω supports reliable interfacing with typical line-level sources. Its simple front- and rear-panel controls allow independent headphone level adjustment, stereo-to-mono summing and muting of monitor outputs without affecting headphone outputs. The compact form factor makes it easy to integrate into existing setups, and line outputs allow chaining to additional headphone amplifiers if more outputs are required.
Connect left and right line inputs from your mixer, audio interface or other line-level source. Connect headphones to any of the four front-panel outputs, and adjust each headphone level control to the desired listening level. Use the line outputs to feed additional headphone amplifiers or downstream devices. If required, engage the stereo-to-mono summing to deliver a mono mix to all outputs, and use the monitor-output mute control to silence rear outputs while keeping headphone outputs active. Ensure the device is connected to an appropriate 120 V AC mains supply before powering on.
Use conservative listening levels when driving high-power output to protect hearing and headphones. For multi-user sessions, set a comfortable reference level for all participants and fine-tune individual headphone volumes as needed. When installing in a rack tray, secure the HP4 with appropriate mounting hardware and leave ventilation clearance around the unit.
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