Professional speaker double 15 inch subwoofer BR-215 Frenquency Response(±3dB):55Hz-180Hz Sensitivity(1w/1m): 100dB SPL Max.SPL: 132dB SPL continuous Impedance: 4 ohms Power Rating(RMS): 1400W Power peak :2800W component inside: low frequency driver: 220mm magnetic diameter. Voice coil diameter: 100mm. Construction: 18mm plywood weight 66kg Dimensions 1000mm x 448mm x 600mm