Carputer... Computer in your Car... Help?

So what i have figured out is the screen and computer and everything else but would like some input on the output of the computer... what i imagine i need to do is run the aux out on the computer into a splitter to put into a cross-over/equalizer and run that into the amps to run the interior speakers and subs... any suggestions cuz i just dont think this will give good sound quality... and for the computer im using an old laptop that i have with a broken screen

GET AHOLD OF JAN BENNET. SHE KNOWS THOSE VERY WELL

Or use that 32 band eq from fosgate sick man bluetooth controls on a pda or palm up to 20 feet away from the car saves diff settings but they bout $600.00 how good you wana sound????????