The CARA models I've done have been different room sizes and shapes, and I use one, two and four subwoofers in various positions in the room. I haven't studied individual speakers so much as I've studied room modes using various subwoofer configurations.About room mode dampers, I think Ethan Winter's basstraps are pretty good. They're built sort of like a false wall, so they can be unobtrusively added to a room. And they work by absorbing energy by sympathetic vibration, which damps room modes.