I think anamorphic hit on it. Klipsch is producing cabinets that are narrower for a lower profile and probably a cost saving on carrying fewer drivers in inventory. The RF83 is the RF7's replacement and although I have tried to listen to the new RF83's, the sound room was nothing more than converted warehouse space that was not conducive to an A B comparison. I doubt you could go wrong with either and from a cost standpoint, the older RF7 series would be a steal from what I have seen on the internet compared to their retail prices just a couple of years ago. Try to buy from an authorized dealer, if possible.