I am using the 7semkIII as my mains, the cc300 for center on the Yamaha vsx-657. I am curious as to what Radio Shack speakers Slappy had used before--what his ears were used to. Compared to my Infinity Kappa 8.1, the Magnepan MMG, the little Advent Prodgiy towers, Pinnacle PN8+,6+ and even the Mach Two, the 7se mkIII are my favorite. (I record my own music and like to have a variety of systems to get the right eq settings.) The Paradigm sound is the most balanced, in my opinion. Not quite as revealing as the Kappa speakers, and not nearly as ear frying as the Advents but similar to the MMG with a lot more bass. The Paradigms have incredible bass management-huge without ever sounding loose or boomy like the Mach Two system did. The Kappas are a tad lean on bass for me. Anyone reading this shopping for used Paradigm speakers, hope this helps you. When it comes to money, all speakers I can own compromise somewhere in performance. Paradigms are the most satisfying in my opinion.