DPP66S: 6 channels 6KW dimmer pack- contains 1 grand master and 6 submaster faders. DPP123S: 12 channels 3KW dimmer pack - contains 1 grand master and 12 submaster faders. *The DPP66S and DPP123S series are designed to be efficient in lighting control and convenience to operate *The preheat setting allows lamp to response fast and also serves as channel test facility. *Double deck casing design segregate high power components and low voltage electronics: The low voltage electronics will not be affected by high power components and keep lower temperature. *The double deck design improves ventilation and serviceable. *Detachable standard 19" rack brackets *Detachable dust filter.