I have a modular marine 2400 overflow using bean animal and it's extremely quiet compared to the old durso on my other tank. The only issue ran into (more of a lack of understanding) is that any change in flow changes the sound. So when putting my DC pumps in feed mode or having them vary flow I get noise. So I can't have different flow patterns throughout the day using my return pumps. This isn't a big deal just one of those "O DC pumps are cool cause I do all these extra things" then I find out it's at a cost. You need a good gate valve on the full siphon in order to dial it in.
The skimmer and UV pumps are the loudest things on my tank and they aren't that loud.
The skimmer and UV pumps are the loudest things on my tank and they aren't that loud.