The PD-30T is a fully environment-resistant compression driver for indoor or outdoor applications recommended for use in expansive and/ or high-ambient sound-level areas. The unit has a power rating of 30 watts, a 1.5" voice coil and a plane wave frequency response of 300 - 3, 900 Hz (+5dB). Transformer-equipped Model PD-30T incorporates the exclusive Atlas Sound Vari-TapÂ® Control/ Connect Center with a screwdriver selectable ohms/ watts switch. The integral 70V line matching transformer is varnish impregnated for maximum environment resistance and life expectancy. It also includes a protective terminal cover with built-in strain relief to assure secure cable connection. The PD-30T is terminated in standard 1-3/ 8"-18" thread male couplings for use with screw-on horns.