I know this works in other areas so maybe on car stereo? Would replacing the factory speaker wire with thicker wires do anything? I think it would be most noticeable in the rear. Im thinking about upgrading my fronts with Alpine SPS-610C and leaving the Infinity mystery model in the rear (dont have the premium audio package), but Im replacing the headliner before that so if there is a chance to add wires or make them better I'd like to do that with nothing in the way.