I have an '88 Toyota 4runner that had a Clarion ProAudio DRX5575 CD receiver in it when I bought. It works fine for now. The deck has 40w x4, and has the power I need. The factory speakers had different plug-in connectors than what after market speakers use. I have hooked up the front speakers, but the rear speakers (factory) have two connectors in each speaker, with at least 6 wires total, per side. I know the wire colors that I need to find, but the head unit has all these extra wires, with more than one white wire. I've never seen a speaker hookup this complicated, and I started buying car audio back in '77.
The deck has some plug in style wires in the back that aren't used, but without removing the deck, which I'm trying to avoid, I can't tell if those are meant to go into an amp . . . so I'm hoping someone can enlighten me on the best way to proceed.