Give your headphones the power they need to sound their best
Top-notch headphones are a great way to experience reference-quality sound for a fraction of the price of a high-end loudspeaker system. But if you're plugging your 'phones straight into the headphone jack on your stereo or PC, you could be missing out on the subtle differences that separate great recordings from the merely good ones. That's because a lot of manufacturers use low-cost, low-fi circuitry to drive their headphone jacks — leaving you with uninvolving, one-dimensional sound. Pro-Ject's Head Box II headphone amp delivers the power you need to bring out the best in your headphones and your tunes. Connect it between your music source and your 'phones to experience richer, deeper bass, clearer highs, and gobs more detail. You'll also hear farther into your favorite recordings for that "you are there" feeling.

Product Highlights:

  • low-distortion headphone amplifier
  • recommended headphone impedance: >30 ohms
  • THD: 0.005%
  • frequency response: 30Hz to 20kHz at ±0.5dB (10Hz to 120kHz at -1dB)
  • signal-to-noise ratio: 94dB (112dB-A weighted)
  • gain: 11dB
  • connections:
    • 1 pair line-level RCA stereo audio inputs
    • 1 pair line-level RCA stereo audio outputs
    • full-size 1/4" stereo headphone output
  • oversized outboard power supply with 5' DC cord included
  • weight: 20 ounces
  • 4-1/16"W x 1-7/16"H x 6"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Why buy a headphone amp?

High-performance headphones need high-quality amplification to perform up to their full potential. If you connect them directly to the headphone jack on your computer, iPod®, or stereo receiver, you may be disappointed. A separate headphone amplifier sends a stronger, cleaner signal to your headphones.

Hands-on research

What's in the box?

Download owner's manual

  • Headphone amplifier
  • AC power supply (with attached 5' DC cord)
  • Instructions For Use

Product Research



Overview: The Pro-Ject Head Box II headphone amplifier is a compact audio amplifier designed particularly to drive headphones. The external headphone amplifier allows for higher possible volumes and greater audio clarity than the smaller, inexpensive integrated headphone amplifiers that are used in most of today's home receivers or audio players. The Pro-Ject headphone amplifier connects to a line-level (RCA-type) input & output of your AV receiver or directly to the line-level (RCA-type) output of your audio source.

Note: Available with a black or silver front-panel.

Construction: The Pro-Ject Head Box II headphone amplifier employs a metal case to shields the circuitry from vibration and electromagnetic interference.

RCA Input/Output: The Pro-Ject Head Box II headphone amplifier features gold-plated stereo input and output RCA phono jacks. The headphone amplifier's connects to your AV receiver's Tape monitor or CD-R/DVR inputs & outputs. It can also connect directly to your audio source's (CD player, Tape, Turntable) audio output.

Headphone Output: The Pro-Ject Head Box II headphone amplifier is equipped with a front-panel 1/4" headphone jack to plug in your headphones.

Volume Control: The Pro-Ject Head Box II headphone amplifier features a front-panel rotary volume knob to control the volume level of your connected headphones.

Power Requirements: The Pro-Ject Head Box II headphone amplifier operates off of standard household current using the included oversized outboard power supply.


Headphone Jack: 3-pole, 1/4"

Gain: 11dB

Power Output: 330mV / 30-ohms, 60mV / 300-ohms

Input Impedance: 47 kOhms

Signal-to-Noise Ratio: 94 ref. full output (112dB-A weighted), 3W power consumption max.

Frequency Response: 30Hz-20kHz (+/-0.05dB), 10Hz-120kHz (-1dB)

THD: 0.005%

Power Consumption: 16V / 120mA AC

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Pro-Ject Head Box II Reviews

Average Customer Review:

4 reviews
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Pro-Ject Head Box II

Written By Anonymous, Lebanon Nj on Friday, February 17, 2012

Crutchfield Customer Review (What's this?)

Overall a poor product. This amp is bright, colored, lacks transparency, and depth. Bass is lacking. There is very little naturalness to the sound of the amp.

Excellent quality

Written By JLW, Pensacola, Fl on Saturday, January 28, 2012

Crutchfield Customer Review (What's this?)

The Pro-ject Head Box II provides audio quality for headphones connected to laptop computers and other smaller devices by allowing you to increase volume. For some who may be wondering the Pro-ject Head Box II is not necessary for improving sound quality by attempting to use it between your home stereo receiver and headphones. The only advantage to making this connection is that you would have an additional volume control knob.

Pros: This is a quality product and is easy to use. All you need is a 3.5mm Stereo Headphone To RCA Adapter Cable to make the connection to your laptop or device.

Cons: A little pricey for what it does.

Good quality product

Written By CEO, Montebello, CA on Saturday, March 26, 2011

Crutchfield Customer Review (What's this?)

I have a Pro-Ject turntable with an older electronic speed control box from Pro-
Ject also. What a difference between the older case and the new style cases!.
Construction is solid and it feels like it's worth the (high price $$). The sound is
clean and distortion free and uncolored tone. I can drive all my headphones
without any problems. I did not give it 5 stars because, I wish it would have a
small and not too bright blue LED power indicator, so I would know that the
device is ON.

Completes my computer/headphone setup.

Written By RexH, Superior, WI on Friday, January 28, 2011

Crutchfield Customer Review (What's this?)

Great sound with this headphone amp. Running a laptop through a DAC into the Pro-ject Headbox ll and some headphones. Would give a full five stars if I had more experience to compare it to. Definitely not dissapointed in making this modest investment to improve the sound of my system.

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