so...you've never heard either eh?Type X is suppose to be the SQ sub but does not pound, L7 does pound but lacked in SQ. So neither one.
From personally hearing R's and X's the R's get louder though, but don't sound NEARLY as good as the X's. But the X's may not have been in a proper install, I didn't get specs on the boxes of either but yeah.x2 on that. the X does some fairly well dmg