Surrounding with books is fine, good even as you're effectively extending the baffle, but as DH says, try and get them on their own brackets directly fixed to the wall behind, otherwise you'll be vibrating everything on the shelves.
@dbr started
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Surrounding with books is fine, good even as you're effectively extending the baffle, but as DH says, try and get them on their own brackets directly fixed to the wall behind, otherwise you'll be vibrating everything on the shelves.