Originally Posted by marauderroy
You will have to run new wires to your fronts or your subs and add an amp to have control of the subs independently. The stock set up only has two (left/right) sets of wires to the factory amp. The amp sends the lows to the rear (subs) and everything else to the front (door) speakers. You can use the speaker level front outputs of your "new" head unit to the factory amp for the door speakers and install an amp and sub in the rear if you need DEEP base. Install you new head unit, Use the speaker level outputs and check out how it sounds. An aftermarket head unit will make the stock amp/speakers sound MUCH better than the stock head unit.
Ok, so what is all this talk about running RCA pre-outs the factory amp then??? Should I just use Line level converters? The ones that convert a speaker lead to an RCA lead? That would make sense to me. And that IS what is pictured above...