Anyone have the factory sub installed?<P>The stock system is great, but I find when I really want to crank it, I have to turn the bass waaaaay down in order to get a balanced sound. I listen to a lot of "synthetic beatz", so I'd rather have a sub to take care of the low end. heh <IMG SRC="http://www.swedespeed.com/ubb/smile.gif"><P>As an option, I know you need the 4 disc HU (800 series?) in order to get the factory unit, but I've got the HU613. Is there a way to make this work?<P>Anyone have pics of the factory sub or an aftermarket solution? <P>THX!