Pro-Ject
Pro-Ject Head Box S2 Headphone Amplifier
Best compact amplifier for listeners seeking high-fidelity shared headphone audio.
The Pro-Ject Head Box S2 is a compact and powerful headphone amplifier designed to elevate your audio experience. It provides the necessary power to reveal the true potential of modern headphones, offering a significant upgrade over built-in amplifier sections. With two front-panel headphone jacks (1/4" and 1/8") that can be used simultaneously, it's perfect for shared listening. The aluminum casing protects against interference, ensuring a rich, dynamic, and transparent sound. This audiophile bargain delivers superior low distortion and ultimate sound performance in a small footprint.
$249.00
Owner Satisfaction
4.6
/ 5
Category Rank
261
/ 759
#261 in Headphone Amplifiers
Price vs Category Average
-82%
Below average
Power output
72532
/ mW (into ohms)
Who it's for
- Audiophiles seeking richer detail and improved dynamic range
- Desktop users with limited space for audio equipment
- Listeners using high-impedance headphones requiring extra power
Who should skip it
- Digital music listeners needing an all-in-one DAC solution
- Users with multiple analog sources to connect simultaneously
- Minimalists wanting to avoid extra power cables and clutter
Performance breakdown
Sonic Transparency
Ultra-low distortion ensures your music remains clean and faithful to source.
Build Integrity
The metal sandwich casing effectively shields against unwanted electromagnetic interference.
Driving Power
Delivers ample headroom for most standard headphones without breaking a sweat.
Desktop Footprint
Compact dimensions make it an ideal fit for crowded workstation setups.
Connectivity Versatility
Dual simultaneous outputs allow for convenient shared listening sessions.
Frequency Extension
Broad response range captures subtle details across the entire audible spectrum.
Key Specs
Power output
725 mW (into 32 ohms)
Signal-to-noise ratio
-110dBV
THD +N
< 0.002%
Gain
11dB
Crosstalk
68dB
Frequency response
20Hz - 80kHz (+-0.2dB)
Power supply
5V/0.5A DC
Standby Power consumption
< 0.5W
Features
- Audiophile headphone amplifier suitable for demanding headphones
- Features both 1/4" and 1/8" headphone jacks, usable simultaneously
- Includes a bypass RCA loop output for connecting additional amplifiers
- Built with superior low distortion and low noise components for ultimate sound performance
- Compact, small footprint design
- Durable aluminum/metal sandwich casing protects against vibrations and electromagnetic interference
- Available in silver or black finishes
What customers say
Customers consistently praise the Pro Ject Head Box S2 Headphone Amplifier for its exceptional sound quality and robust build. Many reviewers highlight how this compact amplifier significantly elevates their listening experience, delivering clear, detailed audio that belies its modest price point. Its solid construction and premium feel contribute to a perception of excellent value, making it a highly recommended upgrade for headphone enthusiasts seeking a noticeable improvement without a significant investment. The device is often seen as a high performing, accessible entry into quality audio amplification.
Know before you buy
Yes, the Head Box S2 features both 1/4" and 1/8" outputs that can be used simultaneously, making it a great option for shared listening sessions.
No, the Head Box S2 is a dedicated analog headphone amplifier. It does not include USB DAC functionality, so you will need to connect it to an external source via the RCA inputs.
The Head Box S2 delivers 725 mW into 32 ohms, which is designed to drive most modern headphones effectively. While it handles demanding loads well, it is optimized for headphones within that standard impedance range.
The bypass RCA loop output allows you to pass the audio signal through to another device, such as a separate power amplifier or active speakers, without needing to disconnect your headphones.
The durable aluminum and metal sandwich construction is designed to shield the internal components from electromagnetic interference and vibrations. This helps maintain a clean, low-noise signal for a more transparent audio performance.
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