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PreSonus HP4

4-channel headphone distribution amplifier

Item #: 861HP4

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Let the whole band hear what's happening

Musicians can't deliver in the studio unless they can hear themselves as well as their bandmates. The PreSonus HP4 ensures that they get plenty of volume in their headphones. Four discrete amplifiers allow you to route monitor mixes to up to four performers. And this amp's robust output ensures they'll hear all the nuance in their performance, so they can nail takes without stopping to complain about low monitor levels.

PreSonus HP4 headphone amplifier

The HP4's discrete amplifiers provide more than enough power to as many as four pairs of headphones.

Independent level controls and 1/4" outputs

Each 1/4" front-panel headphone jack features independent volume control, so each musician can dial in the level to their liking. On the back panel, there are 1/4" stereo outputs for connection to powered studio monitors in a control room. For small home studios that lack separate control rooms, you can mute the 1/4" outputs so the signal plays only through the headphones. There's also a Mono button for summing the left and right input signals for mono output to each pair of headphones.

Easily expandable

The HP4 is designed to handle the most power-hungry pro headphones, but it's also great for most consumer-grade headphones as well. Need to feed more than four pairs of headphones? Get a second HP4 and daisy-chain the two together for eight headphone amps and jacks. Add more for as many headphone connections as you need.

Product Highlights:

  • 4 front-panel stereo 1/4" headphone outputs
  • headphone level control for each channel
  • 2 balanced 1/4" line inputs
  • mono button sums the left and right input channels for output through the headphone jacks
  • 2 balanced 1/4" line outputs for connection to powered studio monitors or daisy-chaining to an additional unit
  • monitor level control and mute button
  • maximum headphone output power: 150 mW per channel
  • output impedance of headphone jacks: 51 ohms
  • headphone impedance range: 32-600 ohms
  • includes AC power supply
  • 5-1/2"W x 1-3/4" H x 5-1/2"D
  • weight: 5 lbs.
  • warranty: 1 year
  • Our 60-day money-back guarantee

PreSonus HP4 Reviews

Hands-on research

What's in the box?

Download owner's manual

  • HP4 Headphone amplifier
  • AC adapter (DC output: 16V 1000mA)
  • AC cord
  • Owner's Manual

Product Research


Overview: The PreSonus HP4 is a compact headphone amplifier with four discrete headphone outputs, each with their own rotary level control. It features 2 balanced inputs, 4 stereo 1/4" headphone outputs, and balanced line outputs. The HP4 is only 5.5" wide and 1.75" high, making it small enough to fit into 1/3-rack space.

Headphone Outputs: The HP4's front panel 1/4" stereo headphone outputs are equipped with rotary volume controls that range from 1 to 12. The output impedance is 51Ω, and will work with most any consumer or professional headphones with impedances between 32Ω and 600Ω. The maximum output power is 150mW per channel.

Monitor Output: On the rear panel, the HP4 has two 1/4" TRS (tip-ring-sleeve) balanced outputs. These line-level outputs can be used to feed a pair of powered monitors or to daisy-chain another HP4 for additional headphone distribution. The volume control for this output is located on the front panel (labeled "Monitor Level"), and has a range of -80 to 0. A separate Monitor Mute button on the front panel allows you to quickly mute the rear panel outputs without adjusting the output level.

Balanced Inputs: The HP4 features left and right 1/4" TRS balanced line-level inputs. These should only be used for signals from sources that do not require pre-amplification. This includes mixers, audio interfaces, CD players, and MP3 players.

Mono Button: When you press the Mono button on the front panel, each input will be summed together on each output. For example, if you plug a CD player into the left input, and press the Mono button, the signal from the left input will be fed to both the left and right channels in the headphones, and to the left and right Monitor outputs. If the Mono button is not depressed, the left and right outputs will carry the separate left and right channel signals, respectively.

Power Supply: The HP4 is powered by the supplied 16V/1000mA AC adapter and power cord.


  • Inputs: Two 1/4" TRS, balanced
    • THD+N: 0.0025%, 1 kHz, unity gain
    • Max Input Level: +18dBu, <0.5% THD+N, unity gain
    • Input Impedance: 10kΩ
    • Frequency Response: 20 Hz - 20 kHz, +/-0.5dB
  • Monitor Output: Two 1/4" TRS, impedance-balanced
    • THD+N: 0.0025%, 1 kHz, unity gain
    • Max Output Level: +18 dBu, <0.5% THD+N
    • Output Impedance: 51Ω
    • Frequency Response: 20 Hz - 20 kHz, +/-0.5dB
  • Headphone Output: Four 1/4" TRS, stereo
    • Max Output Power: 150mW/Ch, <0.5% THD+N, 60Ω load
    • Frequency Response: 20 Hz - 20 kHz, +/-0.5dB, 60Ω load
    • Headphone Impedance Working Range: 32Ω - 600Ω

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