I read in an article the best way to improve audio is to upgrade the speakers. Car is 1992 190E 2.6, that seems to have had a factory phone set up, because the drivers side dash speaker, aside from the normal bullet connecter,(green and black wires) also had double A battery, sized condenser attached to it with a plastic strap that plugged into two wires (blue and brown) via 2 pronged factory plug . I installed two Kenwood 51/4 speakers in the rear and two Kenwood 4" in front using soldered on bullit connecters from old speakers. Both rear speakers went dead in two days, passenger side speaker output is 30% less than drivers side,.. sometimes less. Rehecking every thing I find ....OEM speakers are 6 ohm, Kenwoods are 4 ohm, 4" and 51/4"...Both door speakers work, ... (by running wires from dash speaker wires to door speaker contacts. Alpine amplifier in trunk not working properly (door speakers never made a sound) Dealer: "never heard of one going bad", "Two hours labor to check it out" What killed the rear speakers? Is that condenser vital to this system ? Dealer; "what condenser?.....Got a special telephone speaker in the book, costs 170.oo ........can anyone help untangle this
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18 years ago