Yep, I went thru quite a prolonged phase (for me, i.e. a few months) of trying different Yamaha pro power amps.
Detailed and a bit lean, they sounded good but the multi-100W jobs didn't sound as powerful as the specs led me to expect.
One of them (7000?) had fans that cut in when the going got heavy, and yes, they were audible - I'd imagine they'd be on FULL all the time for you, Bob. ;-)