Pro-Ject Pre Box S3 – Compact Stereo Preamplifier with DAC, Phono & Bluetooth

The Pro-Ject Pre Box S3 is a highly versatile stereo preamplifier designed to act as the central control hub of a modern Hi-Fi system. Combining high-quality analogue circuitry, a built-in phono stage, a high-resolution DAC, Bluetooth streaming, and HDMI eARC support, it seamlessly unites turntables, digital sources, and wireless playback in a compact, audiophile-grade component—available at Soundium.

Key Features

• Audiophile analogue preamplifier design: Low-noise circuitry with short signal paths preserves dynamics, detail, and tonal accuracy
• High-resolution DAC: Cirrus Logic 24-bit / 192 kHz converter with precise clocking for low jitter and accurate timing
• Integrated MM phono stage: Optimised for clean, musical vinyl playback
• Extensive digital connectivity: HDMI eARC, USB-C, coaxial and optical inputs support TVs, streamers, and transports
• Bluetooth 5.0 streaming: Supports aptX and aptX HD for high-quality wireless audio
• Flexible output options: Variable RCA output, fixed line output, and dedicated subwoofer output
• Custom installation ready: 12V trigger output and RS232 control for system integration

Customer Benefits

The Pre Box S3 simplifies complex Hi-Fi systems by combining analogue, digital, and wireless sources into a single compact preamplifier. Whether listening to vinyl, streaming music via Bluetooth, or connecting a TV through HDMI eARC, it delivers a clean, natural, and engaging sound. Its flexible outputs make it easy to integrate power amplifiers, subwoofers, headphone amplifiers, or multi-room setups without compromise.

Quick Specs

• Type: Stereo preamplifier with DAC, phono stage, and Bluetooth
• Phono stage: Moving Magnet (MM)
• DAC: Cirrus Logic CS4344, 24-bit / 192 kHz
• Bluetooth: 5.0 with aptX & aptX HD
• Headphone output: 6.3 mm jack, 16–600 Ω
• Outputs: Variable RCA, fixed line out (3.5 mm), subwoofer RCA
• Dimensions: 20.6 × 5.5 × 15.3 cm
• Weight: 1.02 kg (without power supply)

What’s in the Box

• Pro-Ject Pre Box S3 Stereo Preamplifier
• External power supply
• Remote control
• User documentation

Use Cases / Ideal For

Ideal for compact Hi-Fi systems, turntable-based setups, TV audio via HDMI eARC, Bluetooth streaming, and systems requiring flexible output routing including subwoofers or headphone amplifiers.

Compatibility

Compatible with MM turntables, power amplifiers, active speakers, televisions with HDMI eARC, digital transports, computers via USB-C, Bluetooth devices, and wired headphones.

Pros & Cons

✅ Pros:

• Excellent analogue and digital sound quality in a compact chassis
• Very wide range of inputs including HDMI eARC and USB-C
• Built-in phono stage and high-quality DAC
• Flexible outputs including dedicated subwoofer out

⚠️ Cons:

• No built-in network streaming beyond Bluetooth
• Limited front-panel controls due to compact size

The Pro-Ject Pre Box S3 is a powerful yet space-efficient stereo preamplifier that delivers audiophile sound quality with modern connectivity, making it an ideal heart of a contemporary Hi-Fi system—available at Soundium.