Arcam ST25 Network Streamer There is a straightforward case for a dedicated streaming source. A streaming integrated amplifier is a convenient single box, but convenience has a cost — the streaming platform and the amplifier share a power supply, a chassis, and a ground plane. The ST25 takes a different position: a standalone network streamer, designed in Cambridge, with its own linear power supply and its own isolated platform. Paired with an amplifier that deserves it, the difference is audible. A New Streaming Platform The ST25 is built on an entirely new 6-layer digital audio and streaming platform. A ground plane runs through the entire board, keeping noise and interference away from the sensitive audio components. The DAC is ESS's Hyperstream IV topology, run in a balanced configuration with advanced jitter elimination — the same architecture Arcam use in the SA35 and SA45, here with the significant advantage that it operates in complete isolation from an amplifier stage. Power comes from a new linear toroidal transformer supply that drives the entirety of the ST25's internal operation. A separate switching supply handles standby only — it is not active during playback. The result is a noise floor that a streaming integrated, by definition, cannot match. Streaming resolution reaches 32-bit/384kHz, with gapless playback supported across FLAC, WAV (LPCM), AAC, ALAC, AIFF, DSD up to DSD256, MP3, OGG, and WMA. Display The front panel carries a bonded 6.5-inch high-resolution display showing album artwork and metadata — clearly legible from a normal listening position. It is a considered detail: a streamer you are likely to look at rather than ignore. Streaming and Wireless Wi-Fi is dual-band IEEE 802.11 a/b/g/n/ac/ax across 2.4GHz and 5GHz — current Wi-Fi 6 specification. Setup runs through the ARCAM Radia App, which handles presets, internet radio, and podcasts. The ST25 supports Apple AirPlay, Google Cast, Spotify Connect, Tidal Connect, and Roon Ready. UPnP and USB media playback via USB-A mass storage are also supported. Outputs The ST25 provides both analogue and digital outputs. Analogue: one stereo RCA pair. Digital: one coaxial (RCA) and one optical (Toslink). The analogue output connects directly to an amplifier's line input; the digital outputs allow the ST25 to feed an amplifier or processor with its own DAC stage if preferred. It also includes a control link for ARCAM Radia amplifiers, allowing the two components to operate as a single unit from your device — volume, source selection, and standby all managed together. Technical Specifications Specification Value Max streaming resolution 32-bit / 384kHz Supported streaming formats FLAC, WAV (LPCM), AAC, ALAC, AIFF, DSD (up to 256), MP3, OGG, WMA Gapless playback Yes Digital audio outputs 1× Coaxial (RCA), 1× Optical (Toslink) Analogue audio outputs 1× Stereo RCA pair Wi-Fi IEEE 802.11 a/b/g/n/ac/ax (2.4GHz / 5GHz) Streaming services Spotify Connect, Tidal Connect, Roon Ready, AirPlay, Google Cast Display 6.5" bonded high-resolution Dimensions (W×D×H, inc. feet) 432 × 329 × 99mm Weight (net) 5kg Weight (packed) 7kg Power consumption 15W Network standby
