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Pro-Ject Stream Box S2 Ultra network-enables DACs with USB inputs

For anyone with a ‘dumb’ hi-fi system (not connected to the internet) who wants to stream music from a NAS drive or streaming service, your best bet is to invest in a streamer.

But if your DAC (or pre- or integrated amplifier with DAC) has a USB input, Pro-Ject could have just the streaming device for you.

The Stream Box S2 Ultra (£599) connects to your network via wi-fi or ethernet, and then to a DAC via its ‘audio-optimised’ USB type-A output.

This gives users access to their NAS drive over DLNA, Tidal, Spotify Connect and internet radio – all controllable via the app or over a web browser.

It’s also Roon Ready, so subscribers to the music player software can send files from it to the Pro-Ject.

Essentially, the Stream Box S2 Ultra acts as a network bridge, sending files directly to your DAC. If you have MQA files, for example, there shouldn’t be any incompatibility issues.

There are also two USB inputs onboard for connecting external hard drives, and a HDMI video output for hooking up a monitor to display the Stream Box S2 Ultra’s graphic user interface.


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Becky is Hi-Fi and Audio editor of What Hi-Fi?, and has been part of the team for almost eight years, with her current position preceded by roles as a staff writer and news editor. During that time she has been fortunate enough to travel the world to report on the biggest and most exciting brands in hi-fi and consumer tech (and has had the jetlag and hangovers to remember them by). In her spare time, Becky can often be found running, watching horror movies and hunting for gluten-free cake.