Stream Box S2 Ultra vs Stack Audio Link II
The Link II's max sample rate is 384 kHz against the Stream Box S2 Ultra's 352.8 kHz and its weight 1 kg (2 lbs) against 0.375 kg (1 lbs). Both share bit depth (32-bit) and dsd support (DSD256).
AI-generated product photo — not official manufacturer imagery.
Stream Box S2 Ultra
Pro-Ject Audio SystemsDigitalStreamersHi-Res Players
Estimated price (community-sourced)
$849
Around — community and catalog average, updates slowly
About the Stream Box S2 Ultra
The Pro-Ject Audio Systems Stream Box S2 Ultra is a compact, DAC-less network audio transport designed to feed an external USB DAC. It supports network streaming, local USB storage playback, Internet radio, Bluetooth reception, and multi-room use. Control is available through the Pro-Ject app, a web browser, and Roon. Its USB output is audio-optimized, and its Micro-USB “PC-Detox” connection is intended for use as a USB signal-conditioning/bypass path with a computer source. The product remains listed on Pro-Ject’s official product website; therefore, it is treated as currently manufactured/listed.
Specifications
Digital Audio
DAC capabilities and digital audio processing
- Bit Depth
- 32-bit
- Max Sample Rate
- 352.8 kHz
- DSD Support
- DSD256
Connectivity
Input and output connections
- Bluetooth
- Yes
- Wi-Fi
- Yes
- Ethernet
- Yes
- Digital Inputs
- USB A, Micro USB B, Network (Ethernet, WiFi)
- Digital Outputs
- Audio optimized USB A, HDMI
Streaming Services
Supported streaming platforms and protocols
- AirPlay
- No
- Roon Ready
- Yes
- Spotify Connect
- Yes
- TIDAL Connect
- Yes
- Other Services
- TIDAL, Spotify, Qobuz
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 105 × 37 × 105 mm (W × H × D)
- Weight
- 0.375 kg (1 lbs)
Never published
- Analog Output — the maker never published this. Checked 15 sources on 9 Sept 2026
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions