Some of the Crown amps I have read have very noisy fans, so I would try to listen to one first. As an example I have a Pro Yamaha 4 channel amp that the fans are on constant, and are noisy, but the p2500s, and the p5000s I own and have owned are stone quiet.
Years ago I demoed a QSC, and a Crown amp from a local store, and I picked the QSC as the best sounding with my Martin Logan Sequel IIs. I still really like the QSC amps too.
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