Bah. I had a muffled d4...even at 7v it whined, til it burned out its channel on my fanbus (that took about a minute).
I lined my case with roofers tape (the heavy peel and stick stuff)...still loud.
I went back to my eheim 1048 and my temps didn't change any. Reading the preview to cathar's new article makes me feel dumb for buying the D4 in the first place.
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