Pro-Ject Uni Box S3 – Integrated Amplifier with Hi-Fi Streaming & Pure Analog Sound

Short Description

The Pro-Ject Uni Box S3 is a compact, versatile, and high-performance integrated amplifier. Combining the best of analog tradition with modern Hi-Fi streaming, it features the WiiM OS platform and a fully analog signal path. Supports vinyl, CD, TV, network music, and more—all packed in an elegant, audiophile-grade chassis.

Detailed Description

A bridge between analog and digital

The Uni Box S3 by Pro-Ject Audio Systems redefines the concept of integrated amplifiers. It's not just a network-enabled device, but a true all-in-one audio hub for the modern listener. Unlike many recent amps that sideline analog in favor of streaming, the Uni Box S3 keeps the analog signal intact from the preamp to the output stage.

Hi-Fi streaming without compromise

At the heart of the Uni Box S3 is the WiiM OS™ platform—one of the most advanced streaming systems available. Compatible with Tidal, Qobuz, Spotify, Amazon Music, and more, it ensures a seamless high-resolution experience thanks to the Cirrus Logic CS4344 DAC, supporting up to 24-bit / 192 kHz playback.

Ease of control and connectivity

Control is handled via the intuitive Pro-Ject Home app, allowing quick setup and full-featured operation. The front panel Stream button enables instant Wi-Fi reconnection. It integrates perfectly with multi-room systems, including analog sources such as vinyl or CD players.

Comprehensive I/O options

The Uni Box S3 includes a wide range of connections:

• 🎵 Analog inputs: 1x Phono MM, 2x RCA line-in
• 🎧 Digital inputs: 2x coaxial, 2x optical, HDMI ARC, Bluetooth
• 🔊 Outputs: 4 mm banana speaker terminals, 6.3 mm headphone jack, 1x RCA variable out

The output stage is powered by a TI TPA3221DDV amplifier delivering 2x23 W @ 8Ω and 2x40 W @ 4Ω, ideal for most bookshelf and compact floorstanding speakers.

Compact and elegant design

Housed in Pro-Ject’s signature aluminum chassis, the Uni Box S3 has a compact footprint (206 x 55 x 153 mm) and weighs just 1.1 kg. It’s perfect for anyone seeking high performance and modern features without clutter or complexity.

Why choose Pro-Ject Uni Box S3

• ✅ Pure analog signal path – no digital conversion of analog sources
• ✅ High-resolution streaming with WiiM OS (Tidal, Qobuz, Spotify...)
• ✅ Integrated 24-bit / 192 kHz Cirrus Logic DAC
• ✅ HDMI ARC, Bluetooth, phono & line inputs
• ✅ Multi-room compatible with analog source streaming
• ✅ Sleek all-metal design and plug & play setup

Technical Specifications