I just got one a couple days ago and those fans are loud, no doubt. After opening it up to look at it, noticed it has some big heatsinks, I started thinking about the amps intended use and environment and thought to myself "for home theater what the heck do I need the fans for anyway?" And so all I did was unplug the fans, ran it a good hour with moderate volume while watching a movie and only got slightly warm to the touch, running two sealed 15" titanics with it. So is going through the trouble of replacing the fans even worth it? Think about its intended use and intended environment, this amp is meant to be at a club or other event, where it may get quite warm inside along with other electronics next to it and playing music non stop for hours, pushing out tons of power continuously. When the hell are you going to be doing that in a home theater setting?
I'll fully test this in a couple days and see how warm/hot this thing will really get in a bass heavy movie played at loud volume, but am quite confident these heatsinks in here are more than enough to handle our kind of usage.