There are the in-wall, or in-cabinet varieties that might work for you. With a little re-engineering of the book shelf, that is.

Edit: But, after looking at the product page. There isn't an in-cabinet version for the M22, and I probably wouldn't mount the in-wall on a bookcase. Probably get worse results than with just the M22 bookshelf speaker.

Edited by CatBrat (10/09/12 11:55 AM)