Model 848AT is a wide-range, integrated horn and driver system with a single driver unit having two coaxial horns coupled to opposite sides of the driver diaphragm.The folded construction of the rear horn coupled with the smaller dimensions of the front horn, present a 1,000 Hz acoustic crossover. This separation of frequencies provides a more extended high frequency response and cleaner sound.The 150° horizontal by 110° vertical dispersion pattern is beneficial in many applications requiring a wide coverage pattern. Furthermore, excellent loading is maintained to a low-frequency cutoff of 200 Hz.Architects' and Engineers' SpecificationsThe loudspeaker shall be of the integrated driver and horn style, utilizing two coaxial horns coupled to opposite sides of the driver diaphragm and a larger horn compression molded from fiberglass, a zinc die-cast front horn with phenolic constructed inner horns. The driver uses a high-temperature rated 1.5-inch diameter voice coil.The axial frequency response will extend from 260-10,000 Hz and the horn shall exhibit a low-frequency cutoff of 200 Hz. Sound pressure level will be 105 dB (1 W/1 M) with a 500-5,000-Hz pink noise signal applied, and the horn will produce a horizontal beamwidth of 150° and a vertical beamwidth of 110° at 2 kHz. The horizontal coverage shall be constant over the frequency range of 3 kHz to 10 kHz.The loudspeaker shall be compression-molded fiberglass capable of satisfactory mechanical performance in the temperature range from -40°C to +40°C and not subject to sunlight embrittlement. Other major external speaker parts shall be die-cast zinc and finished in gray polyester paint to match the molded horn parts. All components shall be resistant to damage from weather, moisture and fungus.A steel swivel bracket capable of providing either vertical or horizontal installation and a variety of adjustments, is provided. The loudspeaker shall be 52.0 cm (20.5 in.) high, 26.5 cm (10.5 in.) wide and 54.6 cm (21.5 in.) long.The loudspeaker shall be the 848AT, which includes a 70V/25V transformer and weighs no more than 7.0 kg (15.5 lb).