Shane,
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They say bookshelves filled with randomly sized books/items are really good for this. Maybe you can relocate some bookshelves from other parts of the house, or buy some at IKEA?
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This technique has an interesting heritage. It is a poor-man's "number theory" diffuser, of the sort sold for the last couple of decades by diffuser pioneer RPG Diffusors. These have worked wonders for concert halls, since high diffusion makes performance spaces sound very rich and even.
Anyway, it turns out that this type of diffuser has significant sound absorption qualities that were not previously known. Reverberations times plummeted (surround sound theaters - good; concert halls - bad!), and as a result, some rooms had to be redone, pulling out a number of the diffusers.
So if your HT decor is conducive to bookshelves and books, they are a nice general tonic (though not a cure-all) for your acoustics.
Regards,
Terry