When I first got my amp like 5 years ago I noticed it would get extremely hot at the levels I would run it at. My friend got one of these for me: I wired it up to a switch I got from Home Depot. So every time I'd listen to music at really high volumes, I would switch it on. It was loud, but the music would cover the noise. I've always wanted to improve on this cuz the fan is oversized (120mm and moves air at 105cfm!) and made too much noise. I also wanted to be able to control the fan speed. So, I measured the clearance between the heatsink and the receiver cover and I had about 20mm of clearance. I bought some 60x60x10mm fans that are used on Athlon CPU's and zip tied them together with some packing foam sandwiched between them. I did this: They don't make as much noise as the 120mm fan nor is there any interference. All I need to do now is wait for my fan controller to come in the mail, run some wires, and mount the fans on the heatsink. What do you guys think? Oh, I also bought a 120mm, pretty much silent, 12v fan for my sub's amp (I was able to get the thermal protection to kick on once, oops). Its also going to be connected to the fan controller.