although the R's are definitley not an SQ driver, i disagree completelyI vote RRRR's sound like crap..go the SE route
I had two 12" Type R's in 4 cubes tuned to 35Hz. Sounded good turned down but when I even somewhat cranked them, they sounded very muddy. I guess it is just preference. All I know is that my Nightshade made them look like pieces of crap....That's why I said, going for SPL = R's. More SQ = SE'sType R's don't sound like crap at all. Just not as good as SE's do. But still a very good sub.