... System, Active Speaker,Professional Speaker,bluetooth speaker,wireless speaker,vibration speaker,ipod speaker, iphone speaker,speaker stand,moblie ... high Bass Output. Magnetically ShieldedMagnetically Shielded Sub-woofer Driver. 4" Sub-woofer Drive UnitBig Speaker, Big Base. This Speaker ... -woofer. Wooden MadeWooden Made Sub-woofer body to enhance quality of Bass. Item NO: YM-AV005 2.1 CH vibration ...