There are four families of Revel loudspeakers: Ultima2, the ultimate expression of loudspeaker performance and design. They are simply second to none. Performa; loudspeakers that possess most of the performance and features found in the Ultima family in more traditional cabinet designs. Concerta; utilizing many of the technologies and features found in the Performa family at more affordable prices. In-Wall; Revel performance and quality for custom installation applications.