mj007 said:My Laing DDC had the loudest and most annoying whine I've ever heard of ANY of my computer components. It was louder (by far) than my fans, my Raptors, and everything else in my computer room. The whine was so loud I could hear it out in my living room. The only way to somewhat tame it was to undervolt it. I was incredibly happy when I sold it. Back to Eheim!
Was it a DDC or a D4? What you're describing sounds like a D4's whine.
Basically did it look like this?
or like this?