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Originally Posted by pauldenton
hmm - how much quieter (and at what performance cost) would you get by dropping below 12V? ... the power draw seems within the specs of a sunbeam rheobus....
have you tried different orientations of the pump to see if that affects the noise? (seem to recall the mcp600 is quieter with the intake vertical...)
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My pump gets considerably quiter at below 10V. At 10V it's about the same volume/pitch as one of the Johnson CO30P5-1 pumps @ 12V from the Surplus Center (the pump that BB2K was talking about a while back).
At 7V it's about a match for an Eheim 1048 for performance, with a noise level that would not be easily heard outside of a closed case of a running system.