You can do a lot without too much money. Draperies and bookshelves in the right places go a long way. After that, it's just bass traps, making sure there's room b/t the back of your nearfields and the wall, and killing specific, problematic reflections.
At least, that's what I've observed from some pretty good sounding rooms.
Or…you can just build a sound proof, anechoic space……that'd be awesome. Unfortunately, it's also really expensive.
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