On another forum, a member shared how he had a very nice ten year old system that he and his wife and friends would thoroughly enjoy. His speakers were Miller Kreisel (5 B-1600 bookshelves) along with 2 subs, and his receiver a Marantz 7500. Late last year he decided to upgrade his receiver to get new features. He got the Denon 4250. His speakers went from sounding full, room filling and dynamic to thin and harsh, albeit cleaner. He tried everything to fix it, to no avail. Thinking it might be that the Denon amps had trouble with the 4ohm M&K speakers, he bought Outlaw amps and used the preouts on the Denon. There was some improvement in the sound, notably it was quieter where it should be quiet. Nevertheless the same basic problem remained. So on the advice of a dealer he purchased a Marantz 8801 and bang, problem solved. A person on the forum then insisted that the Denon 4250 and the Marantz 8801 were essentially identical "except for the amps in 4520 and HDAMs in 8801." Well whatever, the Marantz 8801 clearly made him happy, and the Denon 4250 (which he eventually sold) did not, to the point that he no longer had friends over to listen to music. And that's where the rubber meets the road isn't it. This guy also upgraded his speakers and that made an even bigger difference, especially for improved clarity and dynamics. Perhaps if he had tried the Denon after he had upgraded his speakers the Denon wouldn't have been objectionable.
Mark