I just got a Behringer EP 2000 to power an 15" DIY sub that I am finally getting around to putting together. I just plugged it in to listen to the fan noise and it isn't that bad. It's probably quieter than the fan in my PS 3.
I was planning on doing the fan mod that everyone talks about with the 2500, but now that I listen to it, I don't think I'll need to. In our new house that's being built, I think I will have the new sub at the back of the room. I think I might not even hear it from there.
Did Behringer recently switch to quieter fans?