Craig, welcome back, and yes, you misinterpreted Jack's reply and Alan's article. Having speakers on the wall can be fine, but recessing them into "wall units", aka "entertainment centers" or whatever, can cause diffractions/reflections which have an undesirable effect. As long as the port has about 3" of breathing room and the front edge of the speaker isn't recessed, it should work out well.

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Enjoy the music, not the equipment.