Hopefully this is in the right place.
I have been looking around the internet for any expertise on killing the fan noise from my 5.1 receiver. I could find nothing specifically geared toward audio electronics, so I figured I would ask you all.
I have a cheap RCA 5.1 surround sound receiver. I didn't realize when I bought it that it had a fan. The fan is intolerably loud (the high pitched buffeting, not mechanical noise from a broken fan).
The heat sink is a square tube, and I believe that it acts as a echo tube for the fan noise and amplifies it. I've tried reversing the fan and buying quieter 40mm fans. Reversing the fan helped slightly. Quieter fans didn't move as much air, and the unit got hotter than I was comfortable with. I bought a rubber gasket and rubber rings for mounting the fan. Not even sure that helped.
I've tried to hunt down a different heat sink, but couldn't find anything like it anywhere. I am pretty much at a loss of what I should try next.
Here are some pictures of the situation.
Thanks in advance!