18-Inch Powered Subwoofer Connector Type (2) XLR/TRS combo jacks and (2) XLR link outputs Enclosure Material 15 mm, plywood with EVCoat Frequency Response (-10 dB) 35 Hz - 180 Hz Half Space Measurement Frequency Response (-3 dB) 40 Hz - 150 Hz Half Space Measurement Grill 18 AWG steel with powderco..