... Home THeatre System loudspeaker system SPEAKERRated voltage:20w Center 18w,surround :18wResistance:4Ω,center:4Ω,surround:4ΩDriving unit:Front :2*3 ... ''+1*1’’, center: 2*3''+1*1’’surround: 2*3''+1*1’’,Frequency ... range: 'Front: 200Hz-20Hz center: 200Hz-20Hz surround: 20Hz-200HzSensitivity:≥87dBPacking size(L*W*H ...