PD-30-16, Atlas Sound Compression Driver 30-Watt, 16-Ohms (New Old Stock) Model PD-30-16 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-30-16 has a nominal impedance of 16 ohms. Model PD-30-16 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. 30-Watt Power Rating Environment-Resistant Construction for Indoor/Outdoor Use Extended Frequency Response Range for Optimum Intelligibility Offered in 8 or 16-Ohm Models with Transformer Version (PD-30T) Available Outstanding Sound Reproduction and Power-Handling For Signaling, Music and Public Address Systems