I found my mcp350 to be fairly quiet, but there is a high pitched component to its sound and it greatly benefits from vibration isolation from its environment. Initially I had installed an MCW-RES1000, but I found that its mounting of the mcp350 transfered vibrations to the case like a sounding board. I removed it from the metal bracket and laid it on some foam and then I had the mid to high frequency sound at a barely audible level at greater than 3 feet. The next step I took was suspending the mcp350 within dense foam rubber on elastics - this has been completely inaudible for me outside of 3 feet. This final solution does rely on the water loop to remove heat from the pump and in that sense is somewhat counter productive.
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