DESC: Whether the principal loudspeakers in a stereo music system, or the main left and right loudspeakers in a multichannel surround system, the Concerta F12 serves impeccably with Revel''s signature timbral accuracy and astonishing dynamic range. The svelte cabinet occupies less than one square foot of floor space, yet the F12 produces a broad and expansive stage along with an explosive dynamic range with a four driver, three way design that incorporates Revel''s Organic Ceramic Composite (OCC) diaphragm technologies.