Ed, I have only positioned my Seven Pi on the short wall of my 16 x 20 room, so I can't make the comparison between short vs long. When seated my ears are currently ~5-6' back from the convergence point, althouh ideally I'd like to be a few feet closer. Sitting back to far from the convergence point flattens the soundstage, and makes the performance to far removed for my tastes. Sitting right at the convergence point is more like nearfield listening to conventional speakers. Actually very nice if you like to be immersed in the soundstage. A few feet back from the convergence point gives me the right balance. It will probably come down to your personal preferences. Even changing the angle of the high frequency compression driver can alter the presentation quite a bit, so experimentation is your best bet to finding what works for you.