JBL JRX218S 8" Compact Subwoofer PA Loudspeaker 350W 18" Compact Subwoofer The JRX218S is driven by a massive JBL 18" woofer with a cast frame and 3" voice-coil. Features 18 in. compact subwoofer. 350 W (continuous), 1400 W (peak) power capacity. The rugged enclosure is constructed from 19 mm (.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. Attractive 18-gauge perforated steel grille protects components from damage. Specifications Power Rating 350 W / 1400 W Frequency Range (-10dB) 34 Hz - 250 Hz Frequency Response (3 dB) 53 Hz - 250 Hz Sensitivity (@1m) 98 dB SPL Nominal Impedence 4 ohms Recommended Amplifier Power 350 W to 700 W into 4 ohms Maximum SPL (1m) 133 dB Dimensions (H x W x D) 605 mm x 508 mm x 551 mm (23.5 in x 20.3 in x 22 in) Net Weight 32.2 kg (71 lb) LF Driver M118-4 Inputs Neutrik Speakon NL-4 (x2); parallel Enclosure MDF (Medium Density Fiberboard) covered in black carpet.