Second question with the Mach 100 system here, this one concerns the head unit. Forgive me now for not knowing jack about car audio..thats why I bought my system straight from the factory. But my question is...I want to swap out my 6cd indash Mach 1000 deck for a differant unit. Falling into a new job, I can get a pretty good deal on just about anything I want for car audio/video and I am looking into a 7" flip up touchscreen with dvd and all the goodies or a monitor that does all the same but just stays flush to fill the double din slot all the time. Can i hook this up in my car? I was just wondering if it would cause problems with a wiring harness do to the factory subs..any help would be greatly appreciated. Also, if this works, will I be able to tamper with my systems settings more so then a simple Bass and Treble...since the new headunit will likely have a dozen differant dials i can crank up and down..will those settings effect my subs or other speakers?..thanks