I had this issue with my Class A Pioneer M22. I found that putting the amp(s) in an audio rack with thick wooden shelves actually absorbs and holds a fair amount of the heat, that then doesn't permeate the room.
@PTS technically you can't reduce how much heat comes out, merely the rate at which it does. On the downside that means the M22 will run hotter. Probably not enough to put you into the danger zone though.
@Armaegis Technically you can reduce the heat by rebiasing Class A to run cooler, but it probably wouldn't sound as good. The wood absorption method seems to make a big difference though. Less airflow, true, but these amps are build like tanks.
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