Speaker specification: Woof:4 inch 23w Alt: 1.5 inch 8w Output power:18w*2 Output impedance: 40hm Input sensitivity: 520mV SNR:60dB Frequency response subwoofer 40hz-15kHz: Separate degree: 45dB Power supply voltage: alternating current voltage 220V/50Hz Dimensions (length x width x height) (mm) 180*138*263 Packing size (length x width x height) (mm), 4 sets per piece, 420*190*310 Net weight :5.7kg Gross weight :6kg if anybody have interest,please contact me: