Which wires on the OEM wires of an 86 W201 are the ones that I connect the rear speackers to to give it the full bass and stereo. Got the basic hookup but not the full effect of stereo. I have an aftermarket Kenwood in place of the Becker. Also Becker is for sale if anyone wants it.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners