I think I agree with your suspicions in saying some of what your describing may lie in the Sony’s power section being less than adequate for the Kef’s. However I noticed they match it with the same Kef’s during one review I read, they speak more positively about the mating. I was not able to find detailed specs but was less than highly impressed with the Sony's power amp from what I did find. I have De Capo’s and while they sounded quite good on one of the NAD 326 BEE integrated amplifiers they really came alive when I got a larger Bryston hooked up to them.
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