Hi Everyone, I am totally lost on this one ! So I have a 2005 A4 avant Sline B7 with a bose amp but front speakers are head unit powered, it was fitted with a symphony 2 not the plus version so it has ISO stereo wiring and all was fine before fitting the RNSE. Changed symphony 2 for RNSE which was working perfectly in another A4, front speakers work but nothing from the rear. I have searched the hell out of the problem for possible solutions but nothing makes sense...… So I put the symphony 2 back in still no sound from the rear. Tried a speaker test in vcds nothing from the rears. Does anyone know where the bose amp pulls its +ve feeds from ? Or any fuses that I may have overlooked ? Any information will be greatly received !! Thanks in advance.