180-watt Class G, balanced signal paths and complete streaming for the flagship Radia system
Arcam SA45 is a Class G streaming integrated amplifier rated at 2x180 W into 8 ohms, with balanced signal paths, ESS Hyperstream IV DAC, Dirac Live and HDMI eARC.
SA45 is the most powerful streaming integrated system in the Radia family and draws on the heritage of the A49. It combines fully balanced analogue and digital audio paths with Class G amplification, high-resolution streaming and Dirac Live, targeting main stereo systems with demanding loudspeakers and optional subwoofer integration.
Key features
- Class G amplification rated at 2x180 W into 8 ohms and 2x300 W into 4 ohms.
- Balanced analogue and digital audio paths.
- Balanced ESS Hyperstream IV DAC topology.
- Streaming up to 32-bit/384 kHz.
- Dirac Live Room Correction with dual subwoofer outputs.
- Three RCA inputs, one XLR input and MM/MC phono.
- HDMI eARC, two coaxial inputs, two optical inputs and USB-C.
- Spotify Connect, Tidal Connect, Qobuz Connect, Roon Ready, AirPlay 2 and Google Cast.
180-watt Class G
Fifth-generation Class G amplification delivers 180 W per channel into 8 ohms and 300 W into 4 ohms, providing greater reserve than SA35. The output is intended for loudspeakers requiring more current or for larger rooms while retaining the efficiency and low distortion associated with Class G.
Balanced paths and power supply
SA45 uses balanced analogue and digital signal paths together with a new linear toroidal power supply. The six-layer digital platform includes a continuous ground plane to isolate sensitive circuitry, while the ESS Hyperstream IV DAC operates in a balanced configuration with advanced jitter reduction.
Streaming and formats
Spotify Connect, Tidal Connect, Qobuz Connect and Roon Ready operate alongside AirPlay 2 and Google Cast. The Arcam Radia App adds Internet Radio, podcasts, UPnP and USB Media. Supported formats include FLAC, WAV, AAC, ALAC, AIFF, DSD up to DSD256, MP3, MP4, OGG and WMA, with gapless playback.
Dirac Live and two subwoofers
Dirac Live Room Correction measures and corrects system response in the room. SA45 provides two subwoofer outputs on both RCA and balanced XLR, allowing one or two subs to be integrated into a high-level system while maintaining a fully balanced signal chain where required.
Analogue and digital inputs
Three RCA inputs, one balanced XLR input and the MM/MC phono stage cover analogue sources. HDMI eARC connects a television, while two coaxial inputs, two optical inputs, one optical output and USB-C complete the digital section. The pre-out provides a route for further expansion.
Bluetooth and interface
Bidirectional Bluetooth 5.4 supports Snapdragon Sound, AAC, LE Audio and Auracast, allowing both reception and transmission to compatible headphones. The 8.8-inch OLED display shows artwork and metadata from a distance, while Ethernet, IP control and trigger In/Out simplify system integration.
Supplied accessories
The box includes a remote control with two AAA batteries, mains lead, measurement microphone, 5 m USB cable, Quick Start Guide and safety instructions. The distributor specifies a Black finish, dimensions of 432 x 140 x 390 mm and a weight of 17 kg.