Re: JBL MS-8 Stock Amplier Install
I don't have any experience with this particular unit, but it would seem kind of odd to me to have any amplifier before your signal processor. You'd basically be amplifying the signal, processing it, then amplifying it again before it goes to your speakers.
I'm running a Rockford Fosgate 3Sixty.2 and I have it wired up to the speaker outputs coming from the stock HU. If you want to avoid cutting the stock wires, try getting a reverse wiring harness for your car and a regular aftermarket harness (like you would use for installing an aftermarket HU). Wire the two up and splice your signal wires in between the harnesses. I tried this, but my stock HU has a secondary display that wouldn't light up because the aftermarket harness was missing that pin.
If you do cut the stock wires, just make sure you leave yourself some space to re-connect them if you ever need to take the processor out. I just wired up spade connectors on all of the wires I cut so that I can just plug them back in.
Let me know if you have any other questions. Mine was a pretty involved install, and I'd be happy to help you avoid some of the same hassles I went through.
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