Model PD-30 is fully environment-resistant for indoor or outdoor application and recommended for use in expansive and/or high-ambient sound-level areas. 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). Model PD-30 has a nominal impedance of 8 ohms. Model PD-30 is terminated in standard 1-3/8"-18" thread male couplings for use with screw-on horns, or with Atlas Sound Model DA-FH adapter for bolt-on type horns.