Got a brand new Blaupunkt Woodstock DAB52 and for the life of me I cannot get the back speakers to work with out getting feedback through them. I am using an ISO adapter (Autoleads) but if I plug the yellow plug into the the adapter which switches the rear speakers down to the main speaker plug I dont get any sound in the rear speakers. (This worked fine with an Alpine headunit but not this one) If I plug the yellow plug direct in the new head unit I get sound from the back that is fine but if I turn on the ignition i get a load of crazy feed back. Anyone know how this can be solved??