I just found a review of the audio source amp. I believe it is class A/B, not class A. A 150W call A amp would be quite a bit more. The amp had somewhat high THD (.3% at 10KHz) and was not as flat a freq response as the outlaws. The review is at www.hometheaterhifi.com/volume_10_4/audio-source-amp-53-10-2003.html so take a peek for yourself.