The Sound Town STLF-18120DR is a 18" universal replacement woofer for PA/DJ speakers; it is compatible with the Sound Town PA subwoofers and subwoofers of other brands which need a 18" low-frequency driver. The woofer comes with 8-ohm impedance and has a frequency range of 35 Hz - 2 kHz. It is built in a cast aluminum chassis and has a paper cone with cloth edge. With 500W RMS, 1000W peak power handling capability, the STLF-18120DR delivers massive and deep bass and makes a great replacement woofer for your 18-inch PA subwoofers.