My overflows are not the source of noise. It's the flowing and cascading of the water down through the sump at high flow rates you can definitely hear it more than a canister..
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Is your stand not enclosed? Even if it was I know what you mean because I can hear that water coming through to the sump if my stand doors are open. I made a silencer with a sterilite box and plumbed the drain hose from my overflow so that it drains into the box then over the bio-media. That helped quiet things down a bit.
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