Installed a new Kenwood head unit into my otherwise stock 07 A4 (non-bose, symphony).

Anyways, used the PAC harness and everything seems to be working just fine; however, the rear door speakers and amp just don't have the same volume as the stock radio. The read doors speakers and sub are getting audio signal but they aren't as loud as the front speakers. I would expect them to be louder considering it has the factory amp. I tripe-checked the new wiring harness and I am certain there is 12+ vdc going back to the amp for turn-on (white wire in dock n lock connector).

What has me scratching my head is that the dock-n-lock connector is populated with RCA connection points but it makes no difference if I have the Front/Rear RCAs plugged into my Kenwood head unit. I also noticed that the dock-n-lock connector is NOT populated with speaker wires for the rear left/right so I have no idea how the rears are getting an audio signal and why the volume is low.

Any help would be appreciated!

 

i have no clue, but i would check with the technicians at crutchfield.com
idk if you can get much help without buying something, but worth a shot. they know a ton of stuff