With dual SS-18.1s in my ~3,375 cu.ft. room, I get good numbers (flat to ~17Hz). With dual CS-18.1s in his ~2,025 cu.ft. room, my buddy gets awesome
numbers (flat down to ~10Hz).
And we both found the set-up to be very straightforward: Plug everything in, run Audyssey, tweak the Dayton to taste. Ooooh...scary!!
Well, for some people, maybe...