It is designed to withstand long-term exposure to tough, environmental conditions and to provide performance normally associated only with indoor loudspeakers. The R.25 has an 8-inch (203mm) cone LF driver and a 3/4-inch (20 mm) exit HF compression driver with a weather resistant diaphragm. The HF driver is coupled to a nominal 90° x 40° horn. The HF assembly is coaxially mounted with the LF driver. The enclosure and HF horn are molded of UV resistant gray polyethylene. All exposed hardware is stainless steel. The Weather-Stop™ grille assembly, retained by stainless steel screws to the front of the enclosure, consists of three layers.