Features:

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 youre 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 HP4s hallmark. You get left and right line inputs, left and right line outputs with level control, and the four headphone outs. You can globally mute the headphone outs and 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.

Features: Input/Output:

4 screaming-loud (150 mW per channel) stereo ?¬" headphone outputs (front panel)

2 balanced ?¬" line outputs (monitor outputs)

2 balanced ?¬" 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

Physical:

Compact 1/3U rack-mount chassis

Sealed, detented, metal rotary controls

External 16 VAC power supply

Technical Specifications: Inputs:

Connector Type: ?¬" TRS, balanced

THD+N: 0.0025%, 1 kHz, unity gain

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

Input Impedance: 10 kO

Frequency Response: 20 Hz - 20 kHz, ?ø?ñ0.5dB

Monitor Outputs:

Connector Type: ?¬" TRS, asymmetrical, impedance-balanced

THD+N: 0.0025%, 1 kHz, unity gain

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

Output Impedance: 51O

Frequency Response: 20 Hz - 20 kHz, ?ø?ñ0.5dB

Headphone Outputs:

Connector Type: ?¬" TRS, stereo

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

Frequency Response: 20 Hz - 20 kHz, ?ø?ñ0.5 dB, 60O load

Headphone Impedance Working Range: 32O - 600O

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)

Model:	HP4
Manufacturer:	Presonus