Stewart from Sanders web-site:
"Q. OK, I see the advantages of narrow dispersion, yet what happens when I leave the "sweet-spot?" Sanders Sound Systems speakers are designed to bounce the ESL's rear-wave off the wall behind the speaker where it can spread out and fill the entire room. As a result, our speakers sound about the same off-axis as conventional, wide-dispersion speakers. When off-axis, you won't hear the precision image you do at the sweet-spot, however, the sound is quite satisfactory for casual listening or even for home-theater use".
(dealer disclaimer)
"Q. OK, I see the advantages of narrow dispersion, yet what happens when I leave the "sweet-spot?" Sanders Sound Systems speakers are designed to bounce the ESL's rear-wave off the wall behind the speaker where it can spread out and fill the entire room. As a result, our speakers sound about the same off-axis as conventional, wide-dispersion speakers. When off-axis, you won't hear the precision image you do at the sweet-spot, however, the sound is quite satisfactory for casual listening or even for home-theater use".
(dealer disclaimer)