Now i can tell you the following:

ampliefers are wired as usual. plus over 100A directly from car battery, remote to empeg-remote-wire. empeg plus is now over a switch to plus (not ignition plus).
turning empeg off with the switch or even pressing and holding the top button produces a thump..

the problem i dont have with other radios, i had a blaupunkt, a panasonic and a kenwood installed before, there was no problem.