Earson Audio is a professional manufacturer of multimedia speaker. We have wealth experience in research and development. Detail imformation: RMS 4W+2Wx2=8W Drive: 4"+2.5"*2 Impedance: 4bass/4satellite S/N Ratio: 70dB (at 60Hz18KHz) Cabinet Material: Wood Power: 220V/50HZ Magnetically Shield Dimension: Subwoofer: W126xH180xD225 Satellite Speaker:W86xH100xD98 Packing: Color box:L281xW160xH307mm Carton box:L577xW500xH325 6pcs/ctn quantity: 20FT:1848SET 40GP:3864SET 40HQ:4416SET Avoirdupois: Subwoofer: 1.79 kg Satellite Speaker: 0.44 kg If you interest in it, Pls don't hesitate to contact with Kitty.