Thank you too, I do get passionate, overly sometimes, when I felt a need to reference EE theories. Actually we are only partially hijacking the OP' thread because he did ask about how to tell if the amp is class A, AB etc., so looking deeper into the power supply related specs (and that invariable would include the vague power consumption figures) is one way for the average consumer to tell. And yes, I can tell you have some EE background, it's obvious.