Just looked at speaker details showing 90 degree horizontal; but only 5 degrees vertical. The dome and cones are all round. Why isn't the dispersion the same in both planes? Forgive my ignorance. I expect faster answers on this forum than trying to research this.
In most cases, speakers use drivers lined up vertically, the dispersion of the individual drivers doesn't vary, but the summed output will vary because the drivers are not concentric but positioned in a line and putting out different frequencies.
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