I currently have the original CT-15 and I have been happy with it but like the typical home theater enthusiast, I am always looking for ways to improve my system. My question is will the SPL-1200 be an improvement or is the 15 going to out perrform the 1200 because of the 15" driver? Will the 1200 have a cleaner, more defined sound? Will it goes as low? Thanks for any help on this decision?