ATC SIA2-150

Combining the discrete preamp circuits from the high-end SCA2 preamplifier and ATCs renowned MOSFET class A/B power amplifiers, the SIA2-150 offers power and precision to the discerning music fan who wants a simple all-analogue solution to drive their passive loudspeakers.


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  • 150 watts per channel.
  • Discrete MOSFET Class A/B output stages.
  • Discrete class-A low-noise input stages.
  • 5 x stereo RCA/Phono inputs.
  • 3 x stereo RCA/Phono outputs (preamp, subwoofer and tape).
  • Headphone amplifier.
  • IR Remote control.
  • Hand built in the UK & covered by a 6 year warranty.

Max Continuous Power Output: 150W (1% THD, 8 ohms, both channels driven)
Frequency Response: < 2 Hz – > 280 kHz (-3dB)

THD: <0.0008% / 102dB (1kHz, 8 ohms, 1dB below full power)  S+N/N Ratio: >112dB (IEC ‘A’)
Crosstalk: >90dB (10Hz – 20kHz)
Input sensitivity: 350mV (ref. 150W out)
Analogue Inputs: 5 x stereo pairs via RCA/Phono
Analogue Pre-Amp Outputs: 2 x stereo pairs via RCA/Phono
Tape Output: 1 x stereo pair via RCA/Phono

Headphone Amp Output: 1 x stereo via 6.35mm jack

Dimensions: 142 x 453 x 346mm / 5.6 x 17.8 x 13.6 inches (H x W x D inc. terminals)

Weight: 18.3kg / 40.26lbs