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Drivers: LF: 1x12" / MF:1x6.5"/ HF:1x1.75" Rated Power: 550W Recommended Amplifier: 800W Nominal Impedance: 8 ohms Frequency Range: 38Hz-20KHz Sensitivity(1m/1w): 99dB MAX SPL: 129dB Dispersion(HxV) ...