When you had the ducts cleaned, did you also dust every surface and then vac. everything? if not, then there's your dust problem.
Also, dust is composed of (among other things) dirt, dead skin cells, and lint. If you're alive, you go outside, and you do laundry, you're gonna have dust. You'll just have to. . well. . dust it!
As for your stereo system, I wouldn't worry too much. Mine's 8 years old and spent 3 years in a very dusty college dorm (they were drilling thru cement to install ethernet, and there was cement dust EVERYWHERE) and it's working just fine.
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