Exposed ceiling beams treatment?

My listening space has exposed ceiling beams. Is it necessary to treat those corners? If so, should I treat the corners or the the ceiling itself?

Ceiling beams are good, they break up that otherwise large flat surface that would give you coherent and detrimental reflections, and instead add some diffusion. If the beams are few and far apart the next thing I’d think to treat up there (if anything) would be the large ceiling surfaces between them. Maybe try sticking or suspending some thick blankets/towels up there in some non-permanent way first, just to test if it’s worth bothering.

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Thanks for the info and suggestion abm.