Integrated Amps · Arcam

Arcam Radia A25+ Integrated Amplifier

A25+ is the updated version of the Radia A25, adding HDMI eARC, Bluetooth 5.4 with Snapdragon Sound/Auracast/aptX Lossless, a new ESS ES9018K2M DAC, and enhanced power supply vs the original A25 (which used ES9280A Pro). The A25 spec page lists DSD256/128/64 support on USB-C; the A25+ page mentions DSD1024 support per Music Direct. Headphone max output: 2.5V into 32Ω, 5V into 300Ω; load range 16Ω–2kΩ. THD at 80% power, 8Ω, 1kHz = 0.002%. SNR (A-wtd, ref. 50W, 1V input) = 106dB analog; 109dB (A-wtd, ref. 50W, 0dBFS) digital. Preamp output clips at ~1Vrms per Audioholics bench test — intended primarily as a subwoofer output. Class G amplifier topology. 3 RCA line inputs + 1 MM phono input. Bluetooth 5.4: SBC, AAC, aptX, aptX HD, aptX Lossless, LE Audio, Auracast. Specs extracted from web sources: https://www.arcam.co.uk/product,radia,integrated-amplifiers,a25plus.htm, https://www.audioholics.com/amplifier-reviews/arcam-a25-integrated-amp, https://www.audioadvice.com/products/arcam-radia-a25-plus-integrated-amplifier-black 2 spec(s) enriched from web reviews (https://www.audioadvice.com/products/arcam-radia-a25-plus-integrated-amplifier-black, https://www.arcam.co.uk/product,radia,integrated-amplifiers,a25plus.htm).