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. Specifications Frequency Range (-10 dB): 38 Hz - 300 Hz Frequency Response (±3 dB): 55 Hz - 300 Hz Sensitivity : 96 dB SPL Nominal Impedence: 4 ohms *Power Capacity: 350 watts *Peak Power Capacity: 1400 watts Recommended Amplifier Power: 350 watts to 700 watts into 4 ohms Recommended Crossover Settings: 30 Hz HPF, 24 dB / octave; 80 - 100 Hz LPF, 24 dB / octave Maximum SPL: 127 dB Dimensions (H x W x D): 597 mm x 516 mm x 559 mm (23.5 in x 20.3 in x 22 in) Weight: 32.2 kg (71 lbs) Low Frequency Driver: JBL 2043-G Input Connectors: Neutrik® Speakon® NL-4 (x2); ¼" TS phone jack (x1); parallel
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