I can't seem to find a clear answer. I have a 99 GS300. I have a double din JVC head unit. I have sound coming out of all speakers, working just fine. I ran the radio harness to the amp harness behind the glovebox. Replaced old sub with a pioneer. I have a JL audio amp. Can I just leave the factory amp unplugged an run my JL amp straight to my head unit with RCA wires an it work fine? I've never been more confused on hooking up a system before in my life. Any answers would be appreciated