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Atlas Sound DR-54 Series double re-entrant horn is designed for use with a compression driver unit to offer superior music and voice communications over distance and ambient noise. The circular projectors are equipped with a resonance damping ring for best response through an extended frequency range and weather-resistant units will accommodate the Atlas Sound PD75T compression driver. The integral "U-type" steel mounting bracket provides maximum directional aiming flexibility and enhances installation capability when used outdoors or in industrial environments. The rugged all-metal, exponentially-flared horns are finished in durable grey epoxy. The Atlas Sound Model PD75T is a fully environment-resistant 75 Watt driver for indoor or outdoor applications and is recommended for use in expansive and/or high ambient sound-level areas. This model features a sound chamber, phasing plug, magnetic-structure components machined to optimum tolerances, 2" voice coil and offers a plane wave frequency response of 100Hz - 3.7kHz. This unit, which is comprised of a transformer with 16Ω bypass, will meet a variety of applications. The PD75T provides screw-type terminals for matching direct to the 16Ω voice coil impedance and a built-in varnish impregnated, multi-tap 70.7 volt line-matching transformer. Corrosion-resistant terminal connections are protected by a transparent, impact-resistant plastic cover. The PD75T is terminated in a standard 1 3⁄8"-18 thread male couplings for use with screw-on horns. Diaphragms are replaceable with appropriate equipment. The replacement diaphragm is model PD75TDIA. Internal components are enclosed within a protective die-cast and polycarbonate injection molded housing and finished in gray baked epoxy.