ATC SIA2-150 Integrated Amplifier

150 Watt per channel Stereo Integrated Amplifier by ATC. ATC has an enviable heritage of the design and manufacture of no-compromise studio electronics including the power amplifiers included in all ATC Active monitors.


The SCA2 Stereo control pre-amplifier, designed primarily for the purpose of driving Active monitors in both Studio and Hi-Fi installations, has attracted the praise of journalists and recording engineers alike.

The combination of ATC power amplifier and ATC control unit in one stylish housing makes a convenient and affordable package offering the finest sound quality possible in a single Hi-Fi component.

ATC has chosen the balance of features and power output very carefully in order to offer a Hi-Fi component that will meet a very wide range of requirements.

The output power of 150W is sufficient to reproduce well recorded material, Rock, Pop, Classical or Jazz at realistic levels in virtually all domestic situations.

As designers of the worlds most sophisticated drive units ATC are only too aware of the requirements for a power amplifier to properly drive a real loudspeaker load. The grounded source FET power amplifier in the SIA2-150, as also used in all ATC Active monitors, delivers the high current and damping to fully control any passive monitor.

The SIA2-150 is however a supremely subtle and tender performer, conveying the gentler extreme of recorded dynamics with sensitivity and inner detail only possible when all distortions and non linerarities are reduced to levels well below audibility.

The extremely low distortion also explains the tangibility and precision of the stereo sound stage, recreating the full presence of the recording. The simple and direct signal path within the pre amplifier stages of the SIA2-150 preserves subtle low level information and ensures that the whole combination of the pre and power amplifier remains neutral and totally free of colourations.

In fact the SIA2-150 is a perfect match for the absolutely natural and uncoloured reproduction of ATC monitors. A combination that will present your favourite recordings just as the recording engineer intended He was probably using ATC to master the recording anyway!

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SIA2-150 Specifications

Output Power 8 ohm. Both channels driven 150W
Input Sensitivity 500mV
Input Impedance 100k Ohm
Frequency response 5Hz-200kHz +/- 0.1dB
Signal to noise ratio Better than 105dB
Crosstalk Better than 90dB
Distortion 1 kHz Better than -90dB
Remote control (ATC SCAR Handset) On/Off/Standby, Input selection, Tape monitor, Volume
Dimensions 130 x 440 x 325 (HxWxD)
Weight 24kg

Absolute Sound SIA2-150 Review

“Like only the best amps I’ve heard the ATC clings tenaciously to a decaying reverberant field, permitting the ear insights into the recording process that few other integrated amps can match….For all its retro-stylistic flourishes the SIA2-150 is a thoroughly modern instrument that quickly gets down to the business of making music. In my view, fidelity to the source is built on balance—the way sonic criteria interlock like fingers to form a powerful fist—and so goes the SIA2-150. Powerful, dynamic, and virtually colorless, it’s major league all the way. In case you haven’t already guessed, the SIA2-150 is my kind of amp.”
The Absolute Sound

Hi-Fi News SIA2-150 Review

“Fully warmed up the amp had more warmth and body than my Naim NAP 250 reference and sounded slightly softer at the top end. The SIA2-150 is an ideal partner for the SCM20-2. It is also an excellent design in it’s own right, and offers superb value for money in the context of a wider range of speakers”
Hi-Fi News