Hi all,got problem with aftermarket in-car dvd player/screen.Works ok in previous car but after fitting it into my 2002 a4 b6 theres a slight problem that i cant work out.....if i turn up volume (not very loud) at a reasonable volume, the sound starts to break up,its ok up to say volume number 13 but anything after it breaks up,its fitted by using original plugs in the car,ive had a few say its bad earth......been told original earth wire in car was ok for my original chorus headunit but this is more powerful 45 x 4.Any idea's?