The HP4 is powered by an external wall mounted power supply. PreSonus HP4 4-channel Headphone Monitor Features at a Glance: 4 discrete headphone outputs. Dedicated volume pots for each channel. Balanced/unbalanced ¼" TRS I/O. Super-quiet with -98dB noise floor. Wide frequency response.

The loudness of your headphones will vary depending on their design and their input impedance. The output impedance of the HP4 is 51? (ohms), and it will work 

Input - TRS impedance: 10K ohms · Panel Controls - Headphone level: 1 to 12 - Monitor / feed output: - 80dB to + 10dB · Power Supply - Type: linear - Input: 16VAC 

PreSonus approved 12V power supply. Products; Studio Accessories; Headphone Amps; HP4; Accessories . Products Learn Support Events. Log In Crank Your Headphones to 12! HP4: 4-Channel Headphone Amplifier. Crank Your Headphones to 12! HP4: 4-Channel Headphone Amplifier. HP4. HP4. Overview

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Headphone Impedance Working Range: 32Ω - 600Ω We were too, so PreSonus created the HP4 headphone-distribution system. These headphone amps are louder than you're ever likely to need for session and stage use, so be careful with that level control. Yet the sound is clear and clean, with a wide dynamic range.

PreSonus HP4 4 Channel Headphone Amplifier (1/3U) ; Output Impedance, 51Ω ; Frequency Response, 20 Hz - 20 kHz, ±0.5dB ; Connector Type, ¼” TRS, stereo ; Frequency 

Frequency Response, 20 Hz – 20 kHz, ±0.5 dB, 60Ω load ; Headphone Impedance Working Range, 32Ω – 600Ω ; Monitor Outputs ; Connector Type, ¼” TRS, asymmetrical, 

Input Impedance 10 k? Output Impedance 51? Headphone Impedance Working Range 32? - 600? As a commitment to constant improvement, PreSonus Audio 

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

The 51ohm output impedance gives the presonus hp4 a low peak power output, but the dampening factor reduces power output at low ohms which