GRADEChampion Series Size30 cm (12") Maximum Music Power1600 W RMS500 W Frequency Response20 Hz to 1.6 kHz Sensitivity ( 1W / 1m )92dB ImpedanceDual 4Ω Mounting Depth157 mm Cut-Out Dimensionsø283 mm Resonance Frequency37 Hz Xmax11.3 mm Magnet Weight2,540 g Recommended Enclosure35.4 liters