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Pro-Ject Uni Box S3: A Modern Streaming Amp with Analogue Roots

Pro-Ject, the Austrian company beloved for its high-performance turntables, has officially entered the modern streaming amp arena with the new Uni Box S3—a sleek, compact unit that blends traditional hi-fi sensibilities with the streaming convenience of 2025.


Smartphone on a white table displays music with an orange album cover. Nearby are a silver audio device and a black vinyl on a yellow surface.

Analogue Meets Streaming—with Help from WiiM


At the heart of the Uni Box S3 is a surprising collaboration: Pro-Ject + WiiM.


  • WiiM, known for its ultra-affordable streaming tech, powers the S3’s wireless brains

  • The result? Wi-Fi streaming support, a first for any Pro-Ject amp (previous models were Bluetooth-only)

  • Pro-Ject Home app, built on WiiM OS, enables EQ tweaks and multi-room control—mirroring the popular WiiM Home interface



Streaming-Ready: Spotify, TIDAL… But No AirPlay


The Cirrus Logic CS4344 DAC handles digital audio duties, supporting:


  • 24-bit/192kHz high-res playback

  • Spotify Connect & Tidal Connect baked in

  • Bluetooth receiver and transmitter functionality

  • No AirPlay support, a notable omission for Apple users


Still, the S3 stands out as a streaming amp that doesn’t abandon audiophile roots.


Compact Power for Small Spaces


With 40 watts per channel into 4Ω (or 23W into 8Ω), this isn’t a beast—but it’s perfect for high-efficiency bookshelf speakers in small to mid-sized rooms.


  • Amplification design is shared with Pro-Ject’s MaiA S3 ($799)

  • But here, Wi-Fi streaming and expanded I/O justify the $1,099 price


TV displays a modern black building in a field. Below, stereo equipment and a yellow turntable sit on a white cabinet under soft lighting.

Hook Up Everything


Despite its minimalist footprint, the Uni Box S3 is a connectivity powerhouse:


✅ Built-in MM phono stage

✅ HDMI eARC for TV integration

✅ Optical & coaxial digital inputs

✅ RCA line-in

✅ 6.3mm headphone jack

✅ Bluetooth in/out


This versatility lets it anchor a hi-fi system, a vinyl setup, or even a TV-centered media rig—all while looking sharp on a shelf.



Sleek Design, Solid Build


True to Pro-Ject form, the Uni Box S3 features:


  • Aluminum chassis in black or silver

  • Minimalist front panel with volume knob and input buttons

  • Compact proportions that fit neatly in desktop and media setups


Silver audio interface with knobs and ports on the front, labeled "Uni Box S3." Text labels include Phono, Line, Digital, ARC, Stream.

Final Take: A Smart, Small Streaming Solution


Pro-Ject's Uni Box S3 might not break ground with raw power, but it hits a sweet spot in the market:A streaming-ready, phono-friendly amplifier that brings WiiM’s smart connectivity to the turntable crowd.


✅ Clean looks

✅ High-res support

✅ TV-ready via HDMI ARC

✅ Thoughtful analog/digital separation

✅ Seamless control through a robust app



Price & Availability


  • Pro-Ject Uni Box S3

  • $1,099, available now

  • Comes in silver or black

  • Sold through Pro-Ject and authorized dealers


It costs more than the MaiA S3—but if you value Wi-Fi streaming and full system integration, the Uni Box S3 might be Pro-Ject’s most complete amp yet.

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