Yup, listening at 0db both in the car and at home...actually in the car I also hear some of the noise but it's not as bad. It's the sort of noise that seems to be coming from the electronics, the hard drive, etc. It isn't a hiss like you would normally hear with consumer audio equipment.

As for equipment, I've tried different equipment including consumer stereo and also the pro audio stuff in my home studio. I don't quite have "golden ears" but I'm more sensitive than your average listener. But as for that Mark I, I remember there was so much noise it was unusable at home. I am dumfounded that you are not noticing anything.