Hmmm... I think the pump noise must be varying from pump to pump. I found my DDC to be pretty loud, and when I replaced it with the CSP-MAG, it was very quiet in comparison. The CSP-MAG on foam is the quietest I've come across, and is about equal to a Eheim 1048 on foam. I haven't heard the 1046 yet.
Then again I seemed to have gotten a bad MCP-350. It was noisy and didn't start up half the time unless I gave it a hard whack. Too bad I bent off one of the sides and couldn't RMA it anymore. =/
Out of half a dozen pumps I've owned, the CSP-MAG is one of the few that is perfectly reliable, even when heavily undervolted. So from a sample size of one, I would recommend it. Anyone else care to share their noise/reliability experiences?
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