@erik_squires,@erik_squires, I think you are confusing image specificity with frequency response. Sanders ESLs beam like crazy. You will only get high end directly in front of them but because they beam there is much less room interaction and their image specificity is excellent at the listening position. Move of center and the image falls apart as well as the high end rolls off. Speakers with wide dispersion will sound balanced over a wider area but they also have more room interaction. The on center image is not as specific as the Sanders but it still falls apart off center just the same. The high end just does not roll off. You may not notice the image falling apart as much because the image is not as specific on center. What you really want is a crossoverless ESL with a 45 degree dispersion angle. You will get the sharpest on center image with reasonable frequency response across the listening area. The physics of a two channel audio system are such that the only place you are going to get an accurate image is on the center line. That vast majority of systems do not have a very specific image. This is because of the speaker's dispersion, room acoustics, phasing and time problems and asymmetrical frequency response of the two channels.
Read about Ambiophonics.
Read about Ambiophonics.