I just set up all of my components (bluetooth, ipod cable etc.) and the last thing i did was the harness. all connections are perfect and shrink wrapped. they are matched according to color and everything looks fine. the speakers have to be turned up to 40 Vol. in order to hear anything, regardless of the device selected. i suspect the problem stems from my car possibly having an amplified system. i do not know where this amplifier is, or if i even have one. i don't even know if that is the problem. i hooked up a direct wire from an old speaker to the D3 and sound was great. does any one have any idea? i realize this probably doesn't qualify as a radio problem but any help would be greatly appreciated. (my car is a 97 Cadillac deville concours)

Yeah, most likely there is a factory amp in the system, which you would need an adapter to integrate everything right. That would be Metra part #GMOS-06.

thank you very much! I am using the GMRC-03 and the guy at 6th ave said that its made for cars with out an amp but he said if the car had one it would make the volume sound really loud.