Installed the Empeg (Emma as Schofiel calls it) in a BMW, yesterday, and we had quite some difficulty killing a high-pitched interference; like a soft whistling. If that is the 'whining' that you mention, you may want to try connecting the floating ground terminals to the empeg sled. It completely eliminated the problem. Connecting the floating grounds with the Amp's earth didn't make any difference at all.

With the whining removed, Emma sounds great playing MP3s. Radio sound (and reception / features / etc.) is poor. If the antenna amplifier and better software bring it to half the MP3 quality, I'll be really happy.

Henno