Pro-Ject Stream Box S2 Ultra


The Stream Box S2 Ultra is designed to bring high-end network connectivity to any USB-enabled DAC

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Pro-Ject Stream Box S2 Ultra

The Stream Box S2 Ultra is designed to bring high-end network connectivity to any USB-enabled DAC.

Stream Box S2 Ultra

Rather than having to consider expensive or inconvenient upgrades, the small size and attractive price of the Stream Box S2 Ultra means you don’t need to change your system to enjoy wireless (or wired) streaming from any DAC with a USB input.

The USB output is meticulously engineered to offer the very best possible output signal.

With its own dedicated internal power supply and premium components, the USB output “detoxes” the USB signal, removing noise and unwanted artefacts.

The end-result is a sound presentation that is open, clean and detailed, but retaining the raw emotion of the music.

Foremost as a Roon Ready network streamer, the Stream Box S2 Ultra is effortlessly simple to integrate.

It’s instantly recognised by your Roon server once connected to a USB DAC, so you can transmit via Roon’s bespoke RAAT protocol and experience the full Roon experience from any existing, non-Roon-certified equipment.

Second, as a universal network bridge it offers a sophisticated solution for building a small music server based on the popular Volumio platform.

Volumio allows for playback from Spotify, Tidal, Shoutcast (Internet Radio) and Shairport (Airplay), as well as UPnP network services or attached USB hard drives.

Controlled over IP via the responsive in-browser app, or by using Pro-Ject’s own Pro-Ject Play Android app, the Stream Box S2 Ultra is easy to navigate and enjoy – delivering its class-leading digital audio output signal no matter how you choose to use it.

The Stream Box S2 Ultra supports almost any file-type that your DAC does, opening up the option to handle even very high-resolution file types like 352.8kHz PCM and DSD256.

If your DAC is MQA-enabled the Stream Box S2 Ultra can pass-through MQA signals without alteration, for exact unfolding by your DAC.

The Net/PC button also allows for a PC or Server to be directly connected via USB – benefiting from the same USB detox process without the need to send signals over a wireless or wired network.

The Stream Box S2 Ultra is a cutting edge piece of kit. Capable of opening up new possibilities on even ultra-high-end DACs, or for simply building a small, bespoke audio streaming platform, its class-leading, high-end technology and compact footprint make it a must-consider add-on for any serious digital audiophile.

Stream Box S2 Ultra internals

Key Features

  • High resolution network bridge with Roon Ready built-in
  • Network-enables and modern DAC with a USB input
  • Audio optimized USB A output with unique “detox” process
  • Multi-room enabled via Roon or Volumio
  • Two USB inputs for hard-drive connection or keyboard/mouse connections
  • Support for Tidal, Spotify Connect, Shoutcast and Shairport via Volumio
  • DLNA enabled
  • Bypasses all audio formats to the DAC, supplying only a clean, bit-perfect USB signal
  • PC input allows for USB-connected PCs to benefit from the “detox” process
  • Bluetooth input (for control)
  • Uses dedicated power supplies
  • HDMI video output
  • Controllable via smart devices and PC/Laptop
  • Ethernet and WiFi connectivity
  • Available in Black or Silver finish


Stream Box S2 Ultra Specifications
Audio Formats: PCM 32bit/352.8kHz
Internet Radio: Shoutcast
Streaming Services: TIDAL
Spotify Connect
Supported data protocols: RAAT
Multi-room: Up to six devices
Inputs: 2 x USB A
Micro USB B (PC-Detox)
Network (Ethernet, WiFi)
Outputs: Audio optimized USB A
HDMI (Video)
Controllable via: App
Web Browser
Weight: 375g (without PSU)
Dimensions: 105 x 37 x 105mm (W x H x D
S2 Ultra Silver

Additional information


Black, Silver



Pro-Ject was founded in 1991, during the onslaught of the compact disc and CD players, with the mission to offer the best analogue experience for reasonable prices. In a time where the digital audio media had been on the rise, and vinyl was declared as outdated and dead, Heinz Lichtenegger kept his belief in the simple but best way to enjoy music – turntables Their aim is to get as many people as possible into the wonderful hobby that is HiFi audio and to deliver a real stereo experience for the lowest cost possible. The best way to start there is with a proper turntable. They want to give the customers back the right to choose what they need, without overblowing their products with unnecessary features. At Pro-Ject they strive to create astonishing products with impeccable value. They only use the best components for the price and manufacture their handmade goods solely in Europe. With an eye for future trends they are always trying to fit the needs of the market. With an unexpected hit-review of the Pro-Ject 1, the success-story began its first major chapter. With the gaining popularity and interest, more and more international distributors began to make Pro-Ject turntables available in their countries. Today they ship into more than 80 countries world-wide and are happy to share some of their passion with every customer. With cutting edge technologies and machines, they are able to create visually pleasing products without losing the eye for the finest details. In Czech Republic, they produce all their turntables from scratch, by hand and in house. From the tiniest screw to the chassis, everything is done by their technicians. A strict four step quality control ensures that everything works as intended. In Slovakia they manufacture micro sized high end audio components. By shrinking the cabinets to a miniature size, they were able to save costs and offer their customers a true price to performance relation.  


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