Project Head Box S2 Analogue Input Headphone Amplifier. 

The Pro-Ject Head Box S2 has enough power to unleash the best sound quality from any headphone. It features a rich and full sound performance with plenty of dynamics and impressive transparency.

The new S2 casing is a big asset to the design, as not only does it deliver the highest visual appeal, but it is also sturdy enough to protect the internal circuitry against unwanted interferences and vibrations, which can cause unpleasant listening experiences.

Only the best possible components were used to create this unique headphone amplifier. Due to its low price combined with versatility, power and high quality, the Head Box S2 is a true audiophile bargain!

Key Features:

Suitable for demanding headphones
6.35mm and 3.5mm headphone output
Bypass RCA loop output for additional amplifier
Both outputs usable simultaneously
Superior low distortion
Low noise components for ultimate sound performance
Premium S2 chassis
Available in silver

Technical Data:

Power Output: 725 mW (into 32ohms)  
Signal-to-noise ratio: -110dBV
THD +N: < 0.002%
Gain: 11dB
Crosstalk: 68dB
Frequency response: 20Hz - 80kHz (+-0.2dB) 
Analogue Inputs: 1 pair RCA/Cinch sockets   line
Headphone Output: 1x 6.3mm jack, 1x 3.5mm
Analogue Loop Outputs: 1 pair RCA/Cinch
Power Supply: 5V/0.5A DC
Standby Power Consumption: < 0.5W
Dimensions: 103 x 37 x 120 mm
Weight: 365g (Without PSU)