... 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 Stand ... and Bass Volume.3 Type of Input Connections ( Speaker-in, Line-in, Subwoofer-in)With superior Load ... a state-of-the-art Klippel Distortion Analyzer, Polk engineers were able to optimize the woofer's ...