Well, Anthem is not meeting my expectations. I bought an 1140 to go with our new room and the fan noise made me crazy enough to push my local retailer. They did the right thing and got me a new one. The bad news is that the replacement is just as noisy if not even a little more! 8 to 10 db of noise from this @#$% cheap fan they chose. Doesnt even seem to variable speed. Its either on and noisy or off, nothing in between. Its fine for most movie watching, but for 2-channel listening, especially to well recorded acoustic, its hugely distracting.
I worked with Anthem support and installed the beta 2.2.203. No difference on noise level. The beta only seems to delay when it comes on (higher threshold) but does nothing to alter fan speed/noise.
This is REALLY disappointing and its clear they know they have an issue (all of us are complaining and they bothered to do a firmware change). After spending this much having a noisy cheap fan is a rude slap in the face. I guess I have to buy one of those AC Infinity units. They must be partly owned by Paradigm/Anthem? :-/
When I complained about the fan, they told me to contact the dealer to arrange for a repair. The unit was brand new, but I waited more than a month so may be that's why. It really wasn't an issue as one 120mm acinfinity fan on low speed fixed it. I eventually traded it in and the 2nd one is fine.
Replacing the fan yourself should be easy to do. I took a photo of it, but its for the AVM. The MRX likely has the same one but I can't be sure. It certainly is a cheap noisy fan. Doing it yourself may void the warranty. Is your dealer not willing to send you another one?