The Pro-Ject Stream Box S2 Ultra is here to provide the functionality of a streaming media player in a compact box design.

With the explosive growth of high-quality internet streaming services, such as Qobuz, TIDAL, and Spotify, consumer interest has shifted towards network-enabled audio streamer devices.

Many real-time playback products focus on a PC or Mac as a source via USB, and do not offer wifi or ethernet networkability, because of their age or lack of focus on network streaming. The solution has often been to replace them with a new and modern device, streaming media via Bluetooth or to compromise and use an iPhone or tablet via their analog output to feed active speakers or amplifiers.

The perfect solution was hard to find, until now. Stream Box S2 Ultra closes the gap, it offers modern connectivity with its network inputs and USB A output on the streaming box.

This USB output is optimized for audio signals. It uses a dedicated internal power supply and only top audiophile-grade components for the streaming device. You won‘t run into file-support issues, as Stream Box S2 Ultra acts as a bit-perfect network bridge, sending the files directly to your digital-to-analog converter via USB.

Since most DACs have one USB port, we have designed Stream Box S2 Ultra also to be a USB detox device for a cleaner audio signal. Simply connect your PC to the micro USB input of the unit and connect our DAC to the audio output. This way you can clean the noisy signal of your PC, while enjoying your music with it. Control is simple thanks to our iOS and Android compatible “Pro-Ject Play” app. Using your mobile device is even more convenient than a Google Assistant.

Alternately, the StreamBox S2 Ultra can be controlled directly via a USB mouse and attached monitor, web browser, or the powerful Roon software.

Pair it with one of our phono preamps to ensure a clean and powerful signal no matter what you’re listening to.

Additional information
Weight 0.375 kg
Dimensions 10.5 × 10.5 × 3.7 cm



  • High resolution network bridge
  • Audio optimized USB A output
  • Multi-room enabled
  • Dual USB A input for external storage
  • Tidal, QoBuz, Spotify, high-res audio streaming
  • Network-enables any modern DAC with USB input
  • Internet Radio (TuneIn)
  • DLNA enabled
  • Bypasses all audio formats to the DAC
  • Cleans up the audio signal from a PC
  • Fully Roon Ready and certified
  • Shairport
  • Bluetooth
  • Uses dedicated power supplies
  • HDMI video output
  • Controllable via smart devices and PC/Laptop
  • New control app!
  • Ethernet and WiFi connectivity
  • Handmade in Europe


  • Internal Memory: 16 GB
  • Audio formats: PCM 32bit/352.8kHz, DSD256
  • Internet radio: Shoutcast
  • Supported data protocols: RAAT, Shairport, DLNA
  • Multi-room: up to six devices
  • Inputs: 2 x USB A (maximum combined current draw 1A)
  • Micro USB B (PCDetox),
  • Network (Ethernet, WiFi)
  • Bluetooth
  • Supported WiFi standards: 802.11 b/g/n/d/e/h/i
  • Bluetooth: Bluetooth Classic + EDR v2.1, v3.0, v4.0 and Low Energy
  • Outputs: audio optimized USB A, HDMI (video)
  • Outboard power supply: 18V/1A DC (included)
  • Wi-Fi antenna included

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