... Multimedia SpeakerFeatures:• ideal for computer • Volume/bass/treble control • 2.0 Channel active speaker • With audio L/R input , sub out ... "(tweeter) •Frequency response : 85Hz-20Khz•THD(1Khz,1W): <0.1%•Impedance:4Ω•Rated voltage: 110-240V,50/60Hz•Power ... main products include: Home theater system, amplifier, passive/active speakers, commercial audio system and so on. we have attained ISO9001 ...