Can I connect speakers that didn't come packaged with my home theater system to wherever the speakers connect to (in my case, the back of the theater's subwoofer)? Also, I have 2 home theaters, and want to switch the two around, solely because one theater has a receiver that doesn't have any digital audio inputs (it only decodes dvds that go into it's base unit, it doesn't allow other devices to connect to it with digital sound). Would I just be better off switching each full home theater around? I don't really know how I would be able to switch only base units, because one of them has a cable that connects to the subwoofer, which has all the connections for the actual speakers. Maybe I can switch only the base units around some way, so I'd like to know. Thanks.