AudioMaster® compact, two Watt, transformer coupled speaker for use in public address or paging applications. The unique design of this four-inch square speaker centers around the short, folded, re-entrant horn that is interposed between the diaphragm and the surrounding space. The beige, thermoplastic, flame-retardant housing provides greater efficiency and frequency response while blending easily into commercial and industrial spaces. Power handling for the AM50 is 2 W with transformer taps of 2, 1, 1/2 and 1/4. A moveable contact is used to select the power output. The AM50 comes factory preset in the 1/4 W position. Two models of the speaker are available for use in 25 and 70 Vrms distributed systems. This speaker is supplied with wiring terminals and strain relief for inbound and outbound speaker wiring. The AM50 is designed primarily for wall mounting and includes a trim ring for adapting to any standard four-inch square or weatherproof backbox. This speaker is underwriters laboratories listed for fire protective signalling use.