Pro-Ject Uni Box S3 Integrated Streaming Amplifier Black – Analogue Meets Streaming, Seamlessly
All-in-One Hi-Fi Streaming Amplifier | Audiophile-Grade Sound | Modern Connectivity
Break free from the ordinary with the Pro-Ject Uni Box S3, a compact integrated amplifier that flawlessly blends the warmth of analogue audio with cutting-edge streaming. Unlike conventional amplifiers that compromise sound for tech-heavy integrations, the Uni Box S3 preserves the integrity of high-fidelity sound while embracing the modern convenience of Wi-Fi streaming, HDMI-ARC, and multi-room playback.
Key Features:
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All-in-one solution: Amplifier, streamer, DAC, and MM phono stage in one sleek unit
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HDMI ARC: Seamlessly integrates with your TV
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WiiM OS Streaming: Access Spotify, TIDAL, AirPlay 2, and more
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Built-in DAC: Cirrus Logic CS4344, supporting up to 24bit/192kHz
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Phono-ready: MM phono stage for direct turntable connection
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Multi-room capable: Stream connected devices to compatible Pro-Ject streamers
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Hi-Res Audio: Supports FLAC, WAV, AIFF, and more
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European Craftsmanship: Premium materials and hand-assembled build
Seamless Streaming with Powerful Analogue Heart
The Uni Box S3 is purpose-built for music lovers who value both digital convenience and analogue purity. Unlike many modern amplifiers that rely heavily on app-dependent operation, this unit maintains a fully analogue preamp and power amp architecture, preserving the rich, dynamic character of vinyl and CD audio. Powered by WiiM OS, you can effortlessly stream from your favourite platforms including Spotify, TIDAL Connect, and AirPlay 2 via the Pro-Ject Home app.
Elegant, Compact Design with Premium Build
Housed in a robust solid aluminium chassis, the Uni Box S3 not only looks sophisticated but also blocks electromagnetic interference for clean audio output. Its minimalist front panel includes a Stream button for fast pairing and Wi-Fi reset, while the included remote control makes day-to-day use effortless. Compact enough to fit any space, yet powerful enough to drive your favourite speakers, this is the amplifier for those who refuse to compromise.
Versatile Connectivity for Every Audio Source
Whether you're spinning vinyl, playing CDs, or streaming wirelessly, the Uni Box S3 is ready. It features:
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MM Phono Input – For direct turntable connection
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2x RCA Line Inputs – Perfect for CD players or legacy audio gear
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Coaxial & Optical Digital Inputs – Use the onboard DAC with digital sources
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HDMI-ARC – Connect your TV with ease
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4mm Banana-Compatible Speaker Terminals – Clean, powerful connection
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Headphone Out & RCA Subwoofer Pre-Outs – For personal listening or deep bass expansion
True Multi-Room Audio
Uni Box S3 goes beyond the norm by allowing any of your connected analogue or digital sources — whether it’s your turntable, CD player, or even TV — to stream wirelessly to other Pro-Ject devices across your home. Compatible with the upcoming Stream Box S3, Stream Box E, and Wireless Box E (expected late 2025), it’s a future-ready hub for whole-home listening.
Why Choose the Pro-Ject Uni Box S3?
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No App Required – Enjoy powerful performance without being tethered to an app
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Compact Footprint – Space-saving, without sacrificing sonic impact
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Immersive Stereo Sound – DSP-tuned output and coaxial speaker design for precise audio
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Built in Europe – Expertly assembled using eco-conscious, high-quality components
The Ultimate Hybrid: Analogue Soul, Digital Control
The Pro-Ject Uni Box S3 is not just another streaming amplifier. It’s a reimagining of what a high-quality all-in-one system should be — where analogue audio thrives, streaming is effortless, and form meets function in a beautiful compact design.
Upgrade your sound, streamline your setup, and rediscover your music with the Uni Box S3.
Technical Specifications
| Size and Weight |
Power and Audio Specs |
| Dimensions (WxHxD) |
206mm x 55mm x 153mm (176mm with sockets) |
| Weight |
1100g without power supply |
| Power output |
2x 23W / 40W at 8 / 4ohms (1% THD) |
| Frequency response (20Hz - 20kHz) |
< 0.4 - 0.9dB @4ohms |
| Channel separation |
-67dB at 10kHz |
| Signal to noise ratio |
94dB (9dB-‚A‘ weighted) @4ohm |
| THD |
< 0.05% at 10W / 4 ohms |
| Headphone amplifier |
70mW at 32ohm (1%THD) |
| Analogue inputs |
2x pair RCA, 1x phono MM (RCA) |
| Digital inputs |
RCA coax, 2 x Toslink, eARC, WiFi/BT |
| Power amplifier |
Texas Instruments TPA3221DDV |
| DA-converter |
Cirrus Logic CS4344 24bit/192kHz |
| Variable output |
1x pair RCA |
| Speaker connectors |
4mm Ø banana plugs, spades connectors or naked wire |
| Wireless connectivity |
Wi-Fi 5, 802.11 b/g/n/ac 2.4 G and 5G dual bands, Bluetooth 5.1, SBC and AAC |
| Power supply |
20V/3A DC; 100 - 240V, 50/60Hz |
| Standby Power Consumption |
< 0.5 watts |
| EAN |
9120129869140 |
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