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September 13, 2022 at 4:55 pm #26199
Those videos from Erin’s Audio Corner will explain well with examples.
And most people don’t have the space, which is why they put them horizontal instead of vert.
But mostly off axis cancellation of waves (lobing). But that in part is the two speakers playing the same frequencies but far enough away that there are cancellation points. It is in the video I listed.
That doesn’t mean don’t do it, just be aware.