irishspy
There is a stargate in my aquarium.
go for Aqua clear filters.. really quiet and great media options..
I know that's the general experience, but the AC 20 I have is fairly noisy. I've tried reseating the impeller several times and cleaning its housing, but its vibration causes the lid to vibrates, and that's pretty loud. (Enough so it would keep me awake, were the aquarium in my bedroom.) However, I can minimize the noise by running the filter sans lid.
In fairness, my experience seems to be in a distinct minority.