Pro-ject Audio Systems - USA Head Box S3 B

Fully balanced high end headphone amplifier

Made In Europe

Built to Perform, Built to Last

The Head Box S3 B is a high-performance headphone amplifier built around a unique, fully balanced topology that redefines what is possible in its price class. Designed for audiophiles who demand surgical clarity, precision, and flexibility, it supports both balanced and single-ended headphones and integrates seamlessly into modern desktop and hi-fi systems.

Designed with the overarching goal to find the perfect balance between output power and perceived sound quality the Head Box S3 B sets new standards in its price range.

Fully Balanced Power

The Head Box S3 B features a fully balanced signal chain for both RCA and XLR inputs, ensuring maximum channel separation and minimal noise. Balanced headphone connections are available via 4.4 mm Pentaconn and XLR outputs, while single-ended headphones are supported through 3.5 mm and 6.3 mm outputs.

Fully Balanced

Maximum channel separation - minimal noise

By combining true balanced amplification with smart power targets, we allow headphones to perform at their full potential.

Premium Casework

High quality full aluminium

The amplifier is housed in a premium, full aluminium enclosure that provides both mechanical stability and effective shielding.

Made in EU

Precise manufacturing - long-term reliability

Made in Europe by technicians, engineers and designers with decades of experience. Expert craftsmanship. Sustainable products with a long lifetime. Audiophile audio performance.