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PreSonus HP4 4-Channel Headphone Amp

These headphone amps are not just loud enough for session and stage use, they’re loud enough to explode the oysters in a Po’ Boy sandwich. Yet the sound is clear and clean, with a wide dynamic range. At last, everybody will be able to hear—assuming they are capable of hearing. Be careful with that level control!


  • 4 screaming-loud (150 mW per channel) stereo 1/4" headphone outputs (front panel)
  • 2 balanced 1/4" line outputs (monitor outputs)
  • 2 balanced 1/4" line inputs
  • Meters, Controls, and Features
  • Headphone level control for each channel
  • Mono summing switch for each channel
  • Monitor level control
  • Monitor mute switch
  • Daisy-chain multiple units via monitor outputs
  • Compact 1/3U rack-mount chassis
  • Sealed, detented, metal rotary controls
  • External 16 VAC power supply

  • Connector Type: 1/4" TRS, balanced
  • THD+N: 0.0025%, 1 kHz, unity gain 
  • Max Input Level: +18 dBu, <0.5% THD+N, unity gain 
  • Input Impedance: 10 kohm
  • Frequency Response: 20 Hz - 20 kHz, +/-0.5dB
Monitor Outputs
  • Connector Type: 1/4" TRS, asymmetrical, impedance-balanced
  • THD+N: 0.0025%, 1 kHz, unity gain 
  • Max Output Level: +18 dBu, <0.5% THD+N
  • Output Impedance: 51ohm
  • Frequency Response: 20 Hz - 20 kHz, +/-0.5dB 
Headphone Outputs
  • Connector Type: 1/4" TRS, stereo
  • Max Output Power: 130 mW/Ch., <0.5% THD+N, 60ohm load
  • Frequency Response: 20 Hz - 20 kHz, +/-0.5 dB, 60ohm load
  • Headphone Impedance Working Range: 32ohm - 600ohm
  • External Adapter Type: +12 VDC, 1000 mA, center pin positive
  • Dimensions: 1/3U rack-mount (with standard rack tray, not included)
  • Height: 1.75" (44.45 mm)
  • Depth: 5.5" (139.7 mm)
  • Width: 5.5" (139.7 mm)
  • Weight: 5 lbs (2.27 kg)

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