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Federal Signal Audio Master Public Address Speakers are rugged transformer coupled re-entrant speakers for use in public address or paging applications. These speakers features rugged cones and projectors constructed of spun aluminum. The wiring connections are enclosed in a dust- and moisture-proof die-cast aluminum compartment. All external surfaces are finished with a gray powder coat. Four screws inserted through the metal tabs located at the side of the housing make for a simple wall mount. The bottom of these speakers contains two 1/2" conduit openings in the base of the housing to accommodate inbound and outbound audio wiring. The unique shape of the speaker projectors provides an impressive 60 degrees sound dispersion pattern. The projectors are held in position with a Teflon coated lock ring that can be rotated 180 degrees in order to obtain the desired sound distribution.