Size30 cm (12″) Maximum Music Power1500 W RMS500 W Frequency Response20 Hz to 2,300 Hz (-20 dB) Sensitivity ( 1W / 1m )77 dB ImpedanceSingle 4Ω Mounting Depth147 mm Cut-Out Dimensionsø281 mm Resonance Frequency26 Hz Xmax10.7 mm Magnet Weight1,700 g Voice Coil Diameter55 mm Recommended Enclosure35.4 liters.