4-channel Headphone Monitor with 150 mWatts at 51 Ohms
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Now hear this!

Are you and your session players and bandmates tired of straining to hear underpowered headphones? We were too, so we 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. At last, everybody will be able to hear!

Simple and versatile.

Simplicity is the HP4’s hallmark. You get left and right line inputs, left and right line outputs with level control, and the four headphone outs. You can sum the stereo signals to mono, adjust the individual headphone levels, and mute the rear-panel Monitor outputs while leaving the headphone outputs active. So while the HP4 is simple to set up and use, it has all the features you need to create a versatile headphone system.

Compact and expandable.

The compact HP4 can sit on a tabletop or can be screw-mounted to a standard rack tray (not included), where it requires just 1/3 rackspace. And if your needs grow, you can use the line outputs to feed the inputs of a second HP4 or the larger HP60 headphone amplifier. So quit struggling with mediocre headphone amps. Get the HP4 and hear everything loud and clear. You owe it to your music.




4 screaming-loud (130 mW per channel) stereo ¬º” headphone outputs (front panel)

2 balanced ¬º” line outputs (monitor outputs)

2 balanced ¬º” 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

Technical Specifications


Connector Type TRS,balanced

THD+N  0.0025%, 1 kHz,unity gain

Max Input Level +18dBu, <0.5% THD+N, unity gain

Input Impedance              10k

Frequency Response        20Hz - 20 kHz, 0.5dB

Monitor Outputs

Connector Type TRS,asymmetrical, impedance-balanced

THD+N  0.0025%, 1 kHz,unity gain

Max Output Level             +18dBu, <0.5% THD+N

Output Impedance           51

Frequency Response        20Hz - 20 kHz, 0.5dB

Headphone Outputs

Connector Type TRS,stereo

Max Output Power           130mW/Ch., <0.5% THD+N, 60 load

Frequency Response        20Hz - 20 kHz, 0.5 dB, 60 load

Headphone Impedance Working Range    32 - 600


External Adapter Type     +12VDC, 1000 mA, center pin positive


Dimensions         1/3Urack-mount (with standard rack tray, not included)

Height   1.75 (44.45mm)

Depth    5.5"(139.7 mm)

Width    5.5 (139.7mm)

Weight  5 lbs (2.27 kg)

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