The KEF Q350 Bookshelf Speakers are two-way bass-reflex speakers with a 165mm Uni-Q driver & 25mm aluminium dome tweeter merged into one driver array. This driver array is positioned centrally decreasing resonance & promoting optimal clarity. A port designed using computational fluid dynamics ensures you get a powerful bass sound that can be heard very clearly all around the room. Please note: grilles & speaker stands are sold separately.