I used to run a computer muffin fan as well. 1/2 speed as noted above. I always had it set so it exhausted the heat from above, not actually blew on the amp. Reason was so it was a convection type heat removal. It would bring the cool air up from the bottom and not the dust. I had it set about 8" above the top of the amp. I never heard it running.
I don't use it any longer as the amp now has plenty of room to breath after a new setup.
Good luck, John
I don't use it any longer as the amp now has plenty of room to breath after a new setup.
Good luck, John