The Pro-Ject Stream Box S2 Ultra is a versatile audio streaming device designed for high-quality music playback. It supports various streaming services and protocols, making it compatible with popular platforms like TIDAL, Qobuz, and others. The device is optimized for use with Roon, allowing users to enjoy a seamless audio experience with various file formats, including DSD and MQA. The compact design of the Stream Box S2 Ultra allows for easy integration into different audio setups, enhancing overall usability. Its setup process is simplified and can be managed via a web browser or the Pro-Ject Play app, making it user-friendly even for those less technically inclined. The device features USB outputs for connecting to digital-to-analog converters (DACs) and utilizes Ethernet for wired network connectivity, ensuring stable and high-quality streaming. Many users have reported issues relating to playback of DSD files and MQA indicators not functioning correctly in conjunction with specific DACs, indicating potential firmware or compatibility concerns. Overall, the Pro-Ject Stream Box S2 Ultra aims to deliver high-fidelity audio streaming with the flexibility needed to adapt to various audio ecosystems.