After several months with that awful loud noise from my EP2500 I finally got a new fan in the mail! A Papst 8414 NGML (19dB). I just cut the wire on the old one, and used some electrical tape to connect the wires on the new fan. The result? Around 62dB right next to the EP2500.. but my listening position(s) is 4 meters away from the EP2500 - so you don't notice any noise while listening to music or watching movies. Great mod
