ok, i had a kenwood 7100 installed and the rear speakers work, but are very quite. I have read several things in here which I have to be honest, they dont make much sense to me. When it was installed the used the metro 70-1787. Does anyone know how and if you can fix this problem. The front speakers work great but very little volume from the rear. The person who did the install is a friend and a really good installer and he says there is nothing I can do about it. Please Help!!!!

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2005 A4 1.8t tiptronic