Presonus HP4 4-Channel Headphone Amplifier

Now Hear This!

Are you and your session players and bandmates tired of straining to hear underpowered headphones? We were too. That’s why Jim Odom and his jambalaya-fueled team of engineers designed 150 mW headphone amps for the HP4 headphone-distribution system.

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!

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 adjust the overall headphone level, sum the stereo signals to mono, and mute the rear-panel Monitor outputs.

If your needs grow, you can use the line outputs to feed the inputs of a second HP4 or an HP60. Chain as many headphone systems as you need.

So listen up! Quit struggling with mediocre headphone amps. Get the HP4 and hear everything loud and clear. You owe it to your music.

Inputs

Connector Type

¼” 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, Â±0.5dB

Monitor Outputs

Connector Type

¼” 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

¼” TRS, stereo

Max Output Power

130 mW/Ch., <0.5% THD+N, 60OHM load

Frequency Response

20 Hz - 20 kHz, Â±0.5 dB, 60OHM load

Headphone Impedance Working Range

32 - 600 OHM

Power

External Adapter Type

+12 VDC, 1000 mA, center pin positive

Physical
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)