APF Series voice control loudspeakers are equipped with a compression driver to provide up to 15 watts of continuous power handling, superior intelligibility and audio conversion efficiency for maximum sound projection and penetration. APF Series loudspeakers may be flush mounted or recessed directly into interior/ exterior walls or ceilings. Recessed installation may be accomplished by mounting loudspeakers into a 51/ 2" deep opening or recessed enclosure. Units will facilitate Atlas Sound L20 Serie grilles, enclosures and mounting rings (refer to SL2-1372). Accessory mounting kits Model MK-2 or FAMT-6 can be used to mount loudspeakers into 8" diameter baffles. Models include a built-in 25/ 70.7V Vari-Tap transformer featuring a screw-driver adjustable, 7-position watt/ impedance selection switch. Magnet assembly is equipped with self-aligning field replaceable diaphragm. Wiring terminals are protected with a vandal-resistant adapter cover for control equipment utilizing cable or conduit. A built-in, 5 mfd capacitor is provided on Model APF-15TUC for line supervision. Model APF-15TU is not equipped with a capacitor. All units are finished in grey baked epoxy. All models meet or exceed UL Standard 1480 for Fire Protective Loudspeakers and are capable of operating within an ambient temp. range of 66Ã‚Â°C (150Ã‚Â°F) to -35Ã‚Â°C (-30Ã‚Â°F).The all-metal, environmentresistant construction and re-entrant acoustic path assure protection against water, humidity, vermin, physical abuse and corrosion. Models are also California State Fire Marshal Listed.