The Stream Box S2 sits within Pro-Ject's S2 Line, a compact Box Design series that pairs engineering quality with a miniature, shelf-friendly chassis. Sharing the same 103 × 37 × 122mm footprint as the Maia S2 amplifier and Pre Box S2 Digital, the Stream Box S2 is designed to integrate invisibly into an existing system, adding network streaming capability without disrupting the aesthetic of a desk or equipment shelf.
Streaming and Services
The Stream Box S2 supports a wide range of streaming services including Spotify, TIDAL, Qobuz, and Amazon Music, alongside internet radio via TuneIn and iHeartRadio. Network protocols include AirPlay, UPnP, and DLNA, enabling integration with a broad range of third-party apps and control systems. Playback is managed through the dedicated Pro-Ject Stream S2 app, available free for iOS and Android.
Audio Resolution and DAC
Audio conversion is handled by an ESS9023 DAC, with the unit capable of streaming at up to 24-bit/192kHz. Supported file formats include MP3, FLAC, WAV, ALAC, APE, and AAC. Local audio files can be played from a USB storage device via the front-panel USB-A port, and a 3.5mm analogue line input is provided for connecting an additional source such as a portable player.
Multiroom and Connectivity
The Stream Box S2 supports multiroom playback, enabling synchronised audio across up to six units via Wi-Fi or up to ten units via Ethernet. This makes it equally suitable as a single-room solution or as part of a larger whole-home audio system. Network connectivity is via 802.11 b/g/n Wi-Fi or a wired Ethernet connection. Outputs include a fixed-level RCA stereo pair for connection to an amplifier, a variable-level 3.5mm output, and an optical S/PDIF output for connection to an external DAC or amplifier with a digital input.
Construction
The chassis is formed from solid metal, providing both mechanical rigidity and shielding from electromagnetic interference. At 375g without its external power supply, the unit is lightweight enough to be placed on a shelf or stacked with other S2 Box Design components. The Black finish matches the rest of the S2 series.