Readers: It is true that the published bench tests reveal the A500's may not spec, as well as, say a Bryston. That is a fact. Nevertheless, the claim is these differences are subtel :The 500's are more than good enought to "meet all criteria for transpartent sound " , as stated in a review. That critic believes no one , except a few 18 year olds , could actually hear the difference. Well, I'm over 18 so that leaves me out of the debate.
It is my opinion, the A500 , as a mono blocks, are the most amazing find/value in Audio-Land. Period. For what they offer & for such value, an eager ear candy person (like me) can shift funds to upgrading the P/A or speakers to the surprise or chagrin of the other ear hounds. The only unanswered "Q" had to do with reliability; so far they answer as flawless, high performers , at the lowest price. I crown the A500's " The Best Amp(s) for the Price of Dirt " and you would also, should you buy them.