| Re: "Buttresses" in a home theatre room: what are they for?
Agree with Bryan above. Breaking up a nice straight wall really helps avoid standing waves from room modes and direct reflection which can cause comb-filtering effects.
Ideally these opnings would be placed at the point of first reflection and to the sides of the primary listening positions and have some absorptive material in them.
If you wanted to get really fancy, you can cover the cavity from the front with slits or holes and make a helmholtz absorber (or no slits and have a full on panel absorber) in the space.
For a lot of people, though, they can't afford to lose the space in the room.
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