... speaker, subwoofer,woofer,usb speaeker, Multimedia speaker ,Computer Speaker,Mini speaker,MP3/MP4 Speaker, Portable Speaker , Home theatre speaker,Hifi speaker,Speaker Box, Speaker Cable, Speaker ... Bass Volume.3 Type of Input Connections ( Speaker-in, Line-in, Subwoofer-in)Advance Dispersion ... engineers were able to optimize the woofer's motor structure, voice coil alignment and suspension bringing ...