18" Compact SubwooferThe 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 Rating350 W / 1400 WFrequency Range (-10 dB)34 Hz - 250 HzFrequency Response (±3 dB)53 Hz - 250 HzSensitivity (@1m)98 dB SPLNominal Impedence4 ohmsRecommended Amplifier Power350 W to 700 W into 4 ohmsMaximum SPL133 dBDimensions(H x W x D)605 mm x 508 mm x 551 mm (23.5 in x 20.3 in x 22 in)Net Weight32.2 kg (71 lb)Low Frequency DriverM118-4Input ConnectorsNeutrik® Speakon® NL-4 (x2); parallel