The JRX118S is driven by a massive JBL 18" woofer with a cast frame and 3" voice-coil. It's rated at 350 watts (continuous) and 1400 watts (peak) - and that's based on JBL Professional's 100 hour torture test.

Key Features:

• 18" compact subwoofer
• 350 watt (continuous), 1400 watt (peak) power capacity
• The rugged enclosure is constructed from 19 mm (¾ 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 JRX118SP 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.
• 35 mm pole mount receptacle for use with satellite speakers.

Specifications:

• System Type: 18" compact subwoofer
• Frequency Range (-10 dB):1 38 Hz - 300 Hz
• Frequency Response (±3 dB):1 55 Hz - 300 Hz
• Nominal Impedance: 4 Ω
• Rated Maximum SPL2: 127 dB peak, @1 m (3.3 ft)
• Power Capacity3: 350 watts
• Peak Power Capacity3: 1400 watts
• Recommended Amplifier 350 - 700 watts
• Power: @ 4 ohms
• Dimensions (H x W x D): 605 mm x 508 mm x 551 mm
  (23.8 in x 20.0 in x 21.7 in)
• Net Weight: 32.2 kg (71 lb)
• LF Driver: 2043-G
• Input Connectors: Neutrik® Speakon® NL-4 (x2); ¼" TS phone jack (x1) parallel
• Enclosure Construction: 19 mm (¾ in) MDF (Medium Density Fiberboard)
  with glued and mechanically fastened joint detail; covered in black carpet.
• Grille: 18-gauge, powder-coated steel