Pro-Ject Head Box S3 B Headphone Amplifier

The Pro-Ject Head Box S3 B Headphone Amplifier is a fully balanced, high-performance headphone amplifier designed to deliver reference-level sound in a compact and accessible form. Created for audiophiles who demand power, clarity, and flexibility, it brings advanced balanced amplification technology into a price class where such performance was previously unavailable.

Its unique circuit topology ensures exceptional channel separation, ultra-low noise, and a highly controlled sound presentation that allows headphones to perform at their absolute best. Whether used in a desktop setup or as part of a larger hi-fi system, the Head Box S3 B integrates effortlessly and elevates the listening experience.

It supports both balanced and single-ended headphones, making it an ideal solution for users with diverse equipment and listening preferences.

Fully Balanced Signal Path and Advanced Circuit Design

At the heart of the Pro-Ject Head Box S3 B Headphone Amplifier is a fully balanced signal chain that works with both RCA and XLR inputs. This architecture preserves signal integrity from input to output, minimizing interference and ensuring maximum channel separation.

Balanced amplification allows the amplifier to reject noise more effectively and maintain a cleaner, more transparent sound signature. With a frequency response that remains flat across the entire audible range and extremely low distortion figures, the Head Box S3 B delivers precise detail, stable imaging, and a natural tonal balance.

Its signal-to-noise ratio exceeds 115 dB, which guarantees a dark and silent background that allows even the finest musical nuances to emerge clearly and effortlessly during playback.

High Power Output and Versatile Headphone Support

Power delivery is handled by a sophisticated power stage built around two TPA6120A2 amplifier chips. This design enables the Pro-Ject Head Box S3 B Headphone Amplifier to deliver up to 820 mW of fully balanced output power, making it capable of driving a wide range of headphones from low impedance portable models to demanding high impedance studio designs.

Balanced headphone outputs are available through 4.4 mm Pentaconn and four-pin XLR connectors, while single-ended headphones can be connected via 3.5 mm and 6.3 mm outputs. With a minimum supported headphone impedance of 8 ohms, the amplifier ensures compatibility with virtually all modern headphones while maintaining excellent control and dynamics.

Flexible Connectivity and System Integration

The Head Box S3 B is designed to fit seamlessly into modern audio systems with a wide range of connection options. It features one pair of RCA inputs and one pair of XLR inputs, allowing easy integration with both balanced and single-ended sources.

A bypass RCA loop output is also included, enabling connection to an additional amplifier or further expansion of a hi fi system without signal degradation. This flexibility makes the amplifier equally suitable for standalone headphone listening or as part of a more complex audio setup.

The selectable gain structure, offering different gain levels for RCA and XLR inputs, ensures optimal matching with a variety of source components and headphone sensitivities.

Precision Engineering and Premium Construction

Build quality is a defining feature of the Pro-Ject Head Box S3 B Headphone Amplifier. It is housed in a premium full aluminium enclosure that provides excellent mechanical stability and effective shielding against electromagnetic interference.

All control elements and buttons are also crafted from high-quality aluminium, giving the unit a refined feel and long-term durability. The compact dimensions make it ideal for desktop use while still conveying a solid and professional presence.

Available in either silver or black, the amplifier blends easily into any listening environment. Its low standby power consumption further reflects its thoughtful engineering and suitability for everyday use without unnecessary energy waste.

European Manufacturing and Long-Term Reliability

The Pro-Ject Head Box S3 B Headphone Amplifier is proudly made in Europe, reflecting a commitment to precision manufacturing, strict quality control, and long-term reliability. Every aspect of its design focuses on delivering consistent performance and durability over many years of use.

With its fully balanced topology, powerful output stage, versatile connectivity, and premium construction, it represents an exceptional value for audiophiles seeking high-end performance without excessive complexity or cost.

The Head Box S3 B stands as a clear statement of Pro-Ject’s engineering philosophy, combining innovative circuit design with practical functionality and elegant craftsmanship to create a headphone amplifier that truly redefines expectations in its class.