Center channel? We don't need no stinking center channel! The sweet spot is slightly wider than my sofa. The toe-in design increases volume for the opposing speaker; as I move more to the right I am moving more on-axis to the left speaker and off-axis from the closer, right speaker. Since the waveguide for the compression driver forces the dispersion pattern to conform to the woofer's dispersion pattern, vocal and instruments continue to sound natural as I move to the side of the listening area. Even when I sit past the center axis of the opposite speaker; it always sounds like dialog is centered on the screen.
These are large speakers, but in my listening room they go below 25Hz before beginning to roll off. Using an SPL correction table, they are flat to 25Hz, -2db at 20Hz and -6db at 16Hz in my 15'x21'x8' media room. The room is deep enough that I can place the Prismas wider than the screen and have the wide sweet spot effect at the optimal viewing position. The sweet spot at the viewing position is as wide as the speakers are far apart, which allows me to sit in a dinner chair next to the sofa and still hear dialog centered on the screen.
Duke is like a brother to me... but in reality he's just a half-brother. I've listened to his speaker designs for over 30 years. The Rhythm Prisms were the first speakers he made that came into my price range but I got an early adopter/half-brother discount on the Prismas so I went for them. They are incredible. I was expecting 30Hz bottom and 20 lbs lighter. I love them. At the end of the first day of listening to them, I kept thinking, "I'm done. I've got as good speakers as I will ever hear."
The consensus among friends is that I have the best sound system. For demos, I start with movie scenes that show off the projector and sub, then switch to a music video and finally play just audio tracks. It really hammers home the fact that between "good for movies" and "good for music", "good for movies" is a cheap compromise.
