Re pro amps, there are numerous forums online about swapping out noisy fans on Crown, QSC, Behringer ect....truth is, if you're looking at pro amp power, you'd likely be listening to it so loud you would only notice the fan on the very quietest passages. The other option is simply to have your amps in an isolated area or different room. Behringer's A500 is a fanless option as well.
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A person convinced against their will is of the same opinion still.