On the LF amplified speaker there is a 4 wire plug. I need info on the two outside wires, the gray and the red (X13 & X15). I'm replacing the CD/Cassette with a 2002 Sebring 4CD changer unit (MR459823). It uses the same gray and black wiring plugs. I suspect the two outer wires, gray and red, power the amplifier on each speaker. The gray wire connects with a black/green wire and runs separate from the radio plugs loom. I don't know how (or if) it connects to the radio. The red amp wire connects to a black/red but no idea where it goes (or is it where it comes from). Maybe the new unit used a separate amp, but I should still be able to make it work. Any ideas?