I found a set of Z-2300 satellites at a pawn shop for $15 total. It did not come with the subwoofer or the controller. I had the X-540 5.1 system at home, so I connected the Z-2300 to the X-540 sub to make a 2.1 system for my laptop. So far it sounds pretty good. I want to ask if this is okay - won't hurt the sub or the speakers? Anyone mix and match components?