The Arcam SA20 Class G is essentially a hybrid amplifier, utilising Class A specifically for low-level signals, but when required switching in an additional power supply to power those larger sections of the waveform. The SA20 produces 90W per channel at 8ohms.

There are two frequent problems with hi-fi amplifiers. Class A, the traditional audiophile’s choice, uses a single power supply constantly running at full capacity, even when there’s no signal coming through. Great for reproducing those subtle details at low levels however struggles to provide extreme power when needed.

Class A/B, the most common amp class, switches between the two internal amplifiers, one for each half of the waveform. Far more efficient but often a recipe for crossover distortion, since those low-level details we crave can get lost within any mis-match between the two switching over.


  • Class G amplification for impeccable sound and efficiency
  • 90W of power per channel
  • 5 analogue inputs including phono
  • 3 digital inputs
  • 32-bit DAC,Sabre ESS9038K2M
  • Full I/P control
  • Total harmonic distortion + noise = 0.003%

-Continuous power output (0.5% THD), per channel
-Both channels, 8Ω, 20Hz—20kHz 90W
-Both channels, 4Ω, at 1kHz 85W
-Harmonic distortion, 80% power, 8Ω at 1kHz 0.003%

Analogue Inputs
-Phono (MM) cartridge:
-Input sensitivity at 1kHz 5mV
-Input impedance 47kΩ + 100pF
-Frequency response (ref. RIAA curve) 20Hz – 20kHz ± 1dB
-Signal/Noise ratio (A-wtd) 50W, ref. 5mV input 80dB
-Overload margin, ref. 5mV at 1kHz 21dB

Digital Inputs
-Frequency response: 20Hz – 20kHz ± 0.05dB
-Total harmonics distortion + Noise: 0.0007%
-Signal/Noise ratio (A-wtd): 115dB

-Maximum power consumption: 350W
-Dimensions W x H x D (including feet, control knob and speaker terminals): 433x87x310mm
-Weight (net): 8.4kg
-Weight (gross): 10.7kg

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