I've got a kenwood head unit which has a built in amp that can be turned on and off, my problem is that when the amp is on the 4 mains speakers play fine but my sub (using the sub pre-out) doesnt, if i turn the internal amp off the sub plays normally.
the installation guys didnt give me back my 16 pin harness piece. i need a diagram of functions of each pin so i can do some unit testing, could you tell me what they are or point me in the direction of where to find it? thanks