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Unless I'm missing something, the entire value of dispersion to the 45+(or greater) degree region of a speaker has to be the reflections it causes. If you use treatments to absorb all the sound coming from those angles, aren't you really just accomplishing the same thing as a narrow dispersion speaker, but with way more work??
I agree with you personally, but I think what @infinitesymphony was pointing out was that, even if you are absorbing the first lateral reflections, another advantage of wide-directivity speakers may be that a wider sweet spot is possible.
@infinitesymphony I think the confusion arose because you referred to wider "soundstage" as opposed to sweet spot in your post? There's no reason I can think of why wider-directitvity speakers would throw a wider soundstage in the absence of lateral reflections.