Good I'm not alone with that issue. I've spent the whole day installing the MK1 to my gfriends car (using the grounding wires supplied with the MK1) (plus a navigation system which took 99% of that day...) and then installed the MK2 in my car, leaving the whole installation untouched, now I got the same issue, I can hear the disk spinning up, whatever, strange noises all over the place. I havent changed anything, exept I removed the grounding wires between the MK1 and the amp's, so now the Amp's connect directoy to the MK2. I cannot put them back in since the MK1 is fixed installed and I will NOT take them out again :-)

This noise is definately coming from the MK2, there is no change or alternator whine or anything when I start the engine. Tx, J.