The front speakers are amazing. They were so perfect that I brought the rears which were a BIG mistake. I loss sound (as in volume) and the car sounds extremely bassy as in getto as in some young teenager with their first audio buy. Very disappointed Especially the fact that the music is now lower. I would leave the stock speakers in the back alone unless they are cracked etc. I would take it to a reputable stereo shop that deals with german car ir high end stuff. Best Buy and all these chain stores will hack on the wiring or not know the difference between good concert music and some $20 used stereo. It's that bad.