... Speaker, Subwoofer, MP3 Speaker, Multimedia Speaker, Speaker Box, Loudspeaker, Sound Box, usb speaker,PA speaker, portable speaker,Speaker System, Active ... Sub-woofer for lower frequency. This combination makes extraordinary sound quality. BassDuct TechnologyThe BassDuct is engineered to enhance the ... : 0.167(per CTN)Days for Delivery:about 30daysPacking: Gift Box We got the FCC, CE, ROHS and other ...