Ron, I don't doubt your resume or your knowledge. I'm sure you and I could both sit down and put together a kick a$$ system for Nutz in his Xterra. Of course if money were not an issue. In this case, money is an issue as stated in an above comment from Nutz. If Nutz were TRULY worried about sound quality, he should replace the factory headunit, wiring, speakers, amps, add some sound damping, make custom fiberglass enclosures for ALL of his speakers and reposition them for the most accurate soundstage. All Nutz is trying to do here is live in a realistic world where he can improve on what he has for a reasonable amount of money. He doesn't mention that he is replacing the rear speakers. So hooking the factory 6x9's up in parallel with the fronts isn't going to improve the sound versus if he left the rears hooked up to the factory headunit. The tone of the speakers will be different regardless of the power source. Why make that Kicker amp work harder and hotter than it really needs to?

Now, If Nutz wanted to drop about $5000 on a new system, my advice would be completely different.