Bookshelves on wall beside tower speakers

My Paradigm 95s are on a long, (20 foot) bare wall, spaced 8 feet apart, and are 12 inches from the wall. There is a SW1000 sub in between them for bass enhancement.
I want to place 4 foot tall bookshelves on either side of them. Do you think this would affect the performance of the 95s?
 
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