The ETX-18SP from Electro-Voice is a powerful 18" subwoofer from the company's ETX range of PA speakers. The smart FIR-Drive and DSP work together to provide precise coverage at the highest SPLs. It has a power of 1800-Watts. This speaker is equipped with 18" woofer that provides fantastic sound reproduction. The frequency range of this subwoofer is 28 - 180 Hz. It also comes with 2 XLR/Jack inputs and 2 XLR outputs. There are four steerable wheels on the bottom that allows you to easily place it in different locations on-stage.