Well one of them is about 2 weeks old maybe. It was loud when I got it but was getting quiet then I accidentally turned the power to the power strip off and then when it came back it has been loud since. Not as bad as the Aquaclear which I can hear all the way down stairs.
I've had tanks forever, but they've always been in my basement where there were other noises from the extra freezer, refrigerator, washer, dryer etc. and I never noticed the noises of the filters. Now I have some small betta tanks in my room and I notice the noises haha.