ProJect Pre Box S3 Pre Amplifier

ProJect Pre Box S3 Pre Amplifier

The ProJect Pre Box S3 Pre Amplifier is available for demonstration in our Hull store by request.

The ProJect Pre Box S3 Pre Amplifier is a highly versatile stereo preamplifier designed to act as the central control unit of a modern high-fidelity system. Compact in size yet uncompromising in performance, it brings together analogue, digital, TV and wireless sources in a single refined component. Built for music lovers who demand both flexibility and sound quality, the Pre Box S3 integrates seamlessly into premium hi-fi systems where space, performance and aesthetics all matter.

Compact European Design

Finished in either black or silver, the minimalist aluminium chassis reflects Pro-Ject’s commitment to clean European design and vibration-resistant construction. Its compact footprint makes it ideal for modern hi-fi systems where performance is required without sacrificing space or visual appeal.

Audiophile Sound Quality

At the heart of the ProJect Pre Box S3 Pre Amplifier is a carefully engineered low-noise analogue circuit layout, optimised with short signal paths to maintain maximum signal integrity. This design preserves dynamics, tonal accuracy and fine musical detail without unnecessary coloration, allowing every connected source to perform at its best.

High-Resolution Digital Performance

Digital sources are handled by a high-quality 24-bit / 192 kHz DAC with precise internal clocking to reduce jitter and maintain accurate timing. Complete separation of digital and analogue stages prevents interference, ensuring a clean, natural and engaging sound whether streaming, watching TV or playing CDs.

Comprehensive Connectivity

The Pre Box S3 Pre Amplifier is designed to act as the true hub of a contemporary hi-fi system. Analogue inputs support traditional line-level components, while multiple digital inputs accommodate modern sources such as CD transports and network streamers. HDMI eARC connectivity allows direct integration with modern televisions for significantly improved TV audio through your hi-fi system.

Wireless Playback Convenience

Wireless playback support adds everyday convenience, making the ProJect Pre Box S3 Pre Amplifier equally suited to focused listening sessions and relaxed background music throughout the day.

Flexible Outputs and System Expansion

Output options provide excellent system flexibility. A variable RCA output feeds a power amplifier or active speakers, while a separate fixed line-level output allows connection to an external headphone amplifier or secondary audio zone. A dedicated subwoofer output ensures seamless low-frequency integration for full-range performance.

Advanced Control and Installation Features

Beyond sound quality, the Pre Box S3 includes 12V trigger connectivity for automatic power switching and an RS232 interface for custom installation and home automation systems. These features make it equally suitable for traditional audiophile setups and professionally integrated environments.

The Ideal Compact Pre Amplifier

Combining audiophile-grade sound, extensive connectivity and compact European design, the ProJect Pre Box S3 Pre Amplifier delivers outstanding performance and versatility in its class. It is the perfect solution for listeners seeking a high-quality, space-efficient preamplifier capable of handling today’s diverse sources without compromising musical integrity.

ProJect Pre Box S3 Pre Amplifier Specification:

• Frequency response (20Hz – 20kHz): < -0.4dB
• Total harmonic distortion (THD): < 0.007%
• Signal to noise ratio: 110dB (120dB A-weighted)
• Channel separation: -72dB at 10kHz
• DA-converter: Cirrus Logic CS4344, 24-bit / 192kHz
• Line preamp gain: 4.5dB
• Phono preamp gain: 45dB
• Analogue inputs: 2 × pair RCA, 1 × phono MM (RCA)
• Digital inputs: RCA coaxial, 2 × Toslink, Bluetooth, asynchronous USB-C, HDMI eARC
• Bluetooth: 5.0, aptX, aptX HD, A2DP profile
• Outputs: 1 × variable RCA, 1 × fixed 3.5mm jack, 1 × subwoofer RCA
• Headphone amplifier: 2 × 70mW at 32 ohms (1% THD)
• Headphone output: 6.3mm jack (16 – 600 ohms)
• Trigger output: 12V DC, 2-pole coaxial 2.5mm jack
• RS232: Pluggable 3-pin terminal block
• Power supply: 18V / 500mA DC; 100 – 240V, 50/60Hz
• Standby power consumption: < 0.5 watts
• Dimensions (W × H × D): 206 × 55 × 153mm (176mm with sockets)
• Weight: 1020g (without power supply)