KEF Q100 Bookshelf Loudspeakers - Black Oak (Pair) The Q100 features a 5.25 inch Uni-Q driver array, which handles frequencies from 49Hz to 40kHz from a single source. Our specially crafted Uni-Q driver array extends the frequency spectrum while keeping the stereo image balanced, so you hear the same clear sound no matter where you are in the room. At 11.8 x 7.1 x 10.7 inches, these bookshelf speakers are large enough to command a home theater setup, and compact enough for a modest listening room.