PreSonus HP4 4-Channel Headphone Amplifier

Add four headphone jacks to your home studio with this crystal-clear distribution amplifier. Each channel has an individual volume knob and 150 mW of power.

The HP4 from PreSonus answers the need for a headphone distribution amplifier with professional specifications in a small package at an affordable price. The HP4 features four discrete headphone outputs on the front panel each with its own volume potentiometer and 150mW of amplification per channel. The HP4 also features adjustment over control room monitors with a separate volume control, monitor mute switch and mono switch giving you an extremely powerful monitoring solution at an amazingly low price.


- Four high power headphone outputs
- Ultra-loud (150mW per channel)
- Ultra-quiet operation
- Musical wide dynamic range
- Control room monitor outputs with level control
- Mono or stereo operation
- Monitor mute switch
- Daisy chain an infinite number of units
- Compact package
WARNING: Cancer and Reproductive Harm -

- TRS impedance: 10K ohms

Panel Controls
- Headphone level: 1 to 12
- Monitor / feed output: - 80dB to + 10dB
- Mono switch
- Monitor / feed mute

Power Supply
- Type: linear
- Input: 16VAC/1000mA

- TRS balanced: 51 ohms impedance

- THD+noise (unweighted): 0.002%
- Noise floor: -98dB
- Signal to noise: >95dB
- Power supply rejection: >98dB
- Power: 16 watts

- Weight: 5lbs.
- Dimensions: 5.5 x 5.5 x 1.75
- Mounting: max rack and universal rack tray
- Chassis: steel
- Panel: brushed aluminum
- Sides: cast aluminum
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 3.25 lbs
Shipping Dimensions: 13 x 8 x 4 in
Manufacturer Part Number (MPN): HP4
Warehouse Resealed, USED
Shipping Weight: 3.25 lbs
Shipping Dimensions: 10 x 7 x 4 in
Manufacturer Part Number (MPN): HP4
Pack with 4 Pairs of HD9 Headphones
Shipping Weight: 7.5 lbs
Shipping Dimensions: 18 x 14 x 7 in
Manufacturer Part Number (MPN): HD9 / HP4 Pack

For support or warranty questions, please contact the manufacturer:
Phone: 225-216-7887

Reviewers gave this product an overall rating of 4.5 out of 5 stars. (15 ratings)
Submitted January 16, 2010 by a customer from
"Transparent and powerful. Great deal for the money."
Overall: 4.5 out of 5 stars
This review has been selected by our experts as particularly helpful.
I don't know why I would replace it (although it's annoying that I can't turn it off). When I bought it - it was as an afterthought with a couple of sets of $250 headphones. The salesman gave me a little deal on it. For that price I didn't expect for it to be nearly as good as it is sound-wise. If it was stolen I'd probably just get another one. I can't hear the difference between plugging my phones into it - or directly into my Fireface 800. To me, that's the holy grail of headphone amps: same sound, more channels.

I can't believe some of the negative things I'm reading about this headphone amp. Maybe they got unlucky, or I got lucky or... something. Mine has done nothing but work flawlessly since I bought it. It is transparent and powerful - which is exactly what I need. I haven't used the monitor out, but as a headphone amp - it's perfect.

I think the manufacturer put their money into excellent sound quality. The features are sparse. I wish I could turn it off without unplugging it. I wish they had used taper pots instead of linear pots for the volume controls. The usable gain range is small. It's built solid.

Ease of Use
The other side of lack of features is ease of use. There's not much to know here. Plug it in and go.

For my use in the studio it has been a rock. Because it doesn't have an off switch, it's read more basically been running for three years continuously with no problems. I wouldn't hesitate to take it on the road. I suppose you never know for sure from looking at the outside of a product, but this one looks as if its built to take it.

Compared to other units that do the same job, this one is a little more expensive and has fewer features. On the other hand, the quality of the sound is considerably better than others I've used. Other people who have recorded with me have noticed how transparent it is and asked what they were listening to.

Manufacturer Support
I haven't dealt with the company who made it because nothing has gone wrong with it. That's my favorite kind of service: built-in.

The Wow Factor
It's a truck. There's nothing fancy about it. It wouldn't catch your eye. It just works.

Musical Background:
Current hobbyist, former touring musician

Musical Style:
Rock, Fusion, Ambient
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