SC-15-45 Compact High Efficiency Paging Horns 15W @ 45 made by Atlas Sound.
This Series double re-entrant acoustic path loudspeakers are low-cost, weatherproof units which reproduce voice and signal communication with high intelligibility. Models include a built-in 15-watt compression driver with 8 or 45-ohm impedance. Model SC-15-45 is a 45-ohm unit for intercom uses and Model SC-15 is an 8 ohm version for multi-purpose installations. All SC Series loudspeakers are equipped with a high impact molded plastic bell, metal mounting bracket and will an accommodate optional 70.7/25-volt transformer.