Pro-Ject Headbox S2 Headphone Amplifier Overview The Pro-Ject Head Box S2 is a compact, high-performance headphone amplifier designed to elevate your listening experience. With its robust output and precise engineering, it ensures that your headphones perform at their best. Power Delivering 725mW into 32Ω, the Head Box S2 provides ample power to drive a wide range of headphones. Whether you're using high-impedance studio headphones or portable in-ears, this amplifier offers the necessary headroom for dynamic and distortion-free sound. Quality Featuring a frequency response of 20 Hz to 80 kHz ( -0.02 dB), the Head Box S2 ensures accurate and transparent audio reproduction. With a signal-to-noise ratio of -110 dBV and total harmonic distortion plus noise (THD N) of just 0.002%, it delivers clean and detailed sound across the frequency spectrum. Connectivity Equipped with a pair of RCA inputs and two front-facing headphone outputs—6.3mm and 3.5mm—the Head Box S2 offers versatile connectivity options. The RCA loop output allows for integration into larger audio systems, while the dual headphone outputs enable shared listening experiences. Build Housed in a solid aluminium enclosure, the Head Box S2 not only looks sleek but also protects against electromagnetic interference and vibrations. Its compact dimensions (103 x 37 x 120 mm) and lightweight design (365g) make it an ideal addition to any desktop or portable setup. Conclusion For audiophiles seeking a reliable and high-quality headphone amplifier, the Pro-Ject Head Box S2 offers exceptional performance and value. Its powerful output, pristine sound quality, versatile connectivity, and sturdy build make it a standout choice in its category. Output Power 725mW (into 32Ω) Signal-to-Noise Ratio -110 dBV THD N < 0.002% Gain 11 dB Crosstalk 68 dB Frequency Response 20 Hz – 80 kHz (±0.02 dB) Inputs 1 pair RCA Headphone Outputs 1 x 6.3mm jack, 1 x 3.5mm jack Output Impedance < 1Ω Analogue Loop Out 1 pair RCA Power Supply 5V/0.5A DC Standby Power Consumption < 0.1 W Dimensions (W x H x D) 103 x 37 x 120 mm Weight 365g without power supply
