Pro-Ject Stream Box S2 Ultra
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 Pro-Ject Stream Box S2 UltraPro-Ject Stream Box S2 Ultra 

Pro-Ject Stream Box S2 Ultra

  (2 Reviews)
£524.17 Exc. VAT |  


Pro-Ject Stream Box S2 Ultra

An EISA award winner, the Stream Box S2 Ultra is a multi-room enabled, audio optimised network bridge and USB detox device with new control app for added convenience.

Pro-Ject Stream Box S2 Ultra offers modern connectivity with its network inputs and USB A output. This USB output is perfected for audio signals, it uses a dedicated internal power supply and only top audiophile grade components.

Network Ability

With the gaining ground of internet streaming services such as TIDAL or Spotify, the consumer's interest has shifted towards network-enabled devices. Many great sounding products though do not offer any network ability, either because they are too old or their main focus is not on this. The solution has often been to replace them with a new and modern device, stream audio via Bluetooth or to compromise and use a smartphone or tablet via the analogue output to feed active speakers or amplifiers.

Smart addition

You won‘t run into file-support issues, as it acts as a network bridge, bypassing the files directly to your digital to analogue converter. Since most DACs only have one USB input, Stream Box S2 Ultra is designed to also be a USB detox device. Simply connect your PC to the micro USB input of the unit and connect the DAC to the audio output. This way you can clean the noisy signal of your PC while enjoying your music.

Remote Control

The new remote control iOS/Android App is based on an opensource project and has a large community behind it. This guarantees full support and future improvements. Stream Box S2 Ultra is fully remote controllable via smart devices and a regular web-browser. It offers support for the most popular streaming services: Spotify and TIDAL.

Both services offer you a sheer endless amount of music, guaranteeing you, that you never run out of music to listen to. By implementing Shoutcast, we also give you the option to listen to various internet radio stations. You can listen to your favourite radio shows, the news and discover new channels from all around the world – with just a few clicks.


The back-sided HDMI video output lets you connect your monitor to the Stream Box S2 Ultra. It will then show you the graphic user interface, ready to act on your commands. With the implementation of Shairport, we were even able to give the iDevice users out there another possibility to send data to our Stream Box S2 Ultra.

There are two USB inputs on Stream Box S2 Ultra, one front sided and one back sided. Both give you the possibility to connect an external hard drive to the unit. Via one of the various control scenarios (App, Webbrowser, external monitor) you can pick from your own selection of audio. The file system support goes up to PCM 32bit / 352.8 kHz and DSD256.

Roon Ready

Pro-Ject are big supporters of the Roon software, so it comes as no surprise that the Stream Box S2 Ultra is Roon Ready. This means you can simply pick your unit in the Roon interface and send bit-perfect audio streams to it over your network. This incredible feature set makes Stream Box S2 Ultra bullet-proof for all future events. Together with Pre Box S2 Digital, they become the most versatile and audiophile set in its price class.

Key Features

  • High-resolution network bridge
  • Optimised USB A output + dual input for external storage
  • Multi-room enabled, TIDAL/Spotify supported
  • Network-enables any modern DAC with USB input
  • Internet Radio and DLNA enabled, Roon Ready (in progress)
  • Bypasses all formats to DAC + cleanses audio signal from PC
  • Shairport, Bluetooth, Ethernet + WiFi connectivity
  • Uses dedicated power supplies and HDMI video output
  • Controllable via PC/new control app for smart devices

Tech Specs

- Format: PCM 32bit/352.8kHz, DSD256
- Internet Radio: Shoutcast
- Streaming Services: TIDAL, Spotify
- Supported: RAAT, Shairport, DLNA
- Multi-room: Up to six devices
- Inputs: 2 x USB A
- Micro USB B (PC-Detox)
- Network: Ethernet, WiFi
- WiFi: 802.11 b/g/n/d/e/h/i
- Bluetooth: Classic + EDR v2.1/3/4
- Outputs: USB A + HDMI (video)
- Control: Via App, Web Browser, Roon
- Dimensions (WHD): 105 x 37 x 105mm
- Weight: 375g

Average Rating (2 Reviews):  
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Digital seduction
01 May 2021  | 

The addition of the S2 Ultra to my system has brought my digital replay closer to analogue reproduction, especially using the Audio Resampling option on the updated control app. I do however feel that because 99.9% of users will not be digital recording engineers there needs to be some guidance in the instructions on some of the playback options such as "Audio Buffer size" and "Buffer before play" amongst others. The sound produced is now non-fatiguing and very detailed.

The service from the Analogue Seduction team was excellent.

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1 of 1 people found this review helpful.

Best player, great SQ
12 September 2020  | 

Of 5 streamers that I have acquired, this one is the best for playing local files on portable SSDs Front & back USB ports that auto index faster than any player I have EVER used. It plays all of my file types (up to 256 dsf) without clicks and pops like some. Update the OS to access Qobuz and Amazon HR. It ships with Roon, Tidal and Spotify Connect. The only weak point is Shoutcast radio which has slim pickings.
But, it even includes a CD ripping program and 16 Gb of internal storage.
Great sound quality.
I power it with a stepped down (to 18v) Power Pox RS LPS 4 that I had gotten for the RS2 T CD Box, also recommended.

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3 of 3 people found this review helpful.

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