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subwoofer Product name:2.1channel multimedia speaker Product model:SA-33A(red and black color are available) Specification: Output power: RMS 70W(SW:40W; L/R:15W) Rated impedence:4Ohms-8Ohms SNR:> 89 dB Speaker units:4"bass+2*3"full range Frequency response:40Hz-18KHz Description: 1. Built-in USB and SD memory card function, Support MP3 music format 2. With color light 3. With remote control 4. With Karaoke function,2 microphone socket input 5. Volume, bass, treble, echo, mic-volume separately control 6. Compatible with PC/VCD/DVD/CD/TUNER/TAPE/TV and other audio input Dimensions: Subwoofer dimensions:280(L)*253(D)*175(H)mm Satellite dimensions:110(L)*100(D)*230(H)mm Weight: Gross weight:7.5KGS per set Net weight:6.75KGS per set Packing Size: Inner carton:370(L)*310(W)*325(H)mm Master carton:640(L)*385(W)*682(H)mm 4 sets in one master carton Loading Quantity: 20'GP(28m³):666sets 40'GP(58m³):1380sets 40'HQ(68m³):1618sets we can make subwoofer,car surwoofer,subwoofe speaker,subwoofer box,active subwoofer