I'm not real experienced with speakers and all, so any help would be great. I have one of these. http://esupport.sony.com/US/perl/model-documents.pl?mdl=DAVDX255 and I was wondering if I could somehow replace the stock sub with some 12's or 15's that you would normally put in a car. Could I run the sub output from the home theater to another amp and then to the speakers or would that be messy. I think the stock sub is 1.5 ohms. It says on the link when you go to specs.