Midsized Bookshelf Speakers. Full-range, room-filling sound and precise imaging driven by unique technologies. The D9 delivers a truly premium bookshelf listening experience in a midsize footprint. Featuring unique technologies such as our Balanced Double Surround System, linear response waveguide, and laterally offset tweeter assembly, the D9 Mid-Sized Bookshelf Loudpeakers deliver top-shelf, balanced audio for any application.