I have done some work in the general area (one patent related to amp heat sink design 6,515,859 Roberts , et al. February 4, 2003), and advise caution about reversing forced air cooling direction.cyrano said:Funny.
I just ordered that Behringer for an art project as it's the cheapest decent 4-channel amp I could find. It will be driving some small KEF bookshelf speakers, so I don't need/want kilowatt power.
The fan is really noisy. I'll probably be replacing it with a 24V Papst one and reversing airflow so it blows out the back. Might look into including a filter too.
Changing direction of air flow can dramatically degrade effectiveness of cooling. When blowing air, you have a pretty good idea of where it will go. When pulling air the flow is more diffuse. Of course you can design it to work either way, but generally the two designs are quite different.
JR
PS: I have no idea what Behringer is doing inside, and little motivation to find out. The modern class D chip sets are quite good, so using the amp as designed should be OK.