The CIS50 (5.25-inch driver, coaxial) ceiling loudspeaker is outfitted with an auxiliary HF cone coupled to the LF cone to provide a smoother, more extended frequency response in comparison to other 5 in drivers. It is supplied with an integral multi-tap 70-/100-volt line transformer adjustable by a connector on the transformer. The steel backcan is fitted with unique clamps that can significantly reduce installation time. The driver/baffle assembly then easily installs in the pre-mounted backcan with spring-loaded hardware.