JBL JRX218S Portable 18" Stage Subwoofer 18 inch compact subwoofer 350 W (continuous), 1400 W (peak) power capacity The rugged enclosure is constructed from 19 mm (0.75 in) MDF (Medium Density Fiberboard) using advanced adhesives and mechanical fastener technology for durability and improved low-frequency performance; The enclosure is covered in black carpet A top mounted, cast aluminum 35 mm pole mount receptacle can receive an optional SS3BK pole to facilitate use of the JRX218S as a base for a midhigh speaker cabinet Non-resonant, all steel handles are used