Features: 5.25inch 4ohm 120w and 5.25inch 8ohm 120w; 4ohm and 8ohm square bass speakers can be selected The newly developed 5.25-inch subwoofer features a high-power, long stroke design 4-layer long stroke voice coil with large volume, strong, fast, elastic, and clean low-frequency It is an upgraded unit for the computer subwoofer and 5.1 speaker subwoofer Pay attention to matching power, and the minimum power amplifier should not be lower than 35W. Specifications: Item: 5.25inch Square Subwoofer Optional：4ohm and 8ohm Voice coil diameter：approx 25mm Model 52LF01 Calibers 5.25 Power 40W Recommended volume6.8L Impedances 492/82 Material of the sound pot: cotton and hemp+bark Frequency response 63Hz-4.5KHz High grade ferrite magnetic material Sensitivity 87dB+3dB Horn height 72mm Horn through-hole 122mm Horn sinking hole 151mm Horn sinking position 4mm Diagonal screw 140mm Package Includes: 1PC 5.25inch Square Subwoofer note: (1 inch = 25.4mm or 1mm = 0.0393 inch) 1. Please allow 0-2cm error due to manual measurement. Please make sure you do not mind before you bid. 2. The colors may have different as the difference display,please understand.