Slowing the fans down should be OK. The fans are designed to deal with continuous full power operation which does not occur with home audio use. I have CarverPro ZR1600 amps, and there is a low noise fan mod that is recommended. Reportedly these fans are almost inaudible. I bought the fans, but have not yet installed them because the amps are located in the cellar and fan noise is not a problem for me.
tweaking cooling fans
The fans in my pro amps make too much noise.My thought is to put inline with the 24vdc a potentiometer to reduce voltage and slow the fans down.I have used the amps with the fan disconnected but they get warm to the touch,not hot.I would like a nice breeze across the heatsinks.I picked up a bunch of 3.5k ohm potentiameters.Your thoughts.