Features: Engineered with 4inch magnet structure and neodymium magnets, this full ranges woofer delivers powerful 30W bass output, and 4ohm impedance for seamless integration into car music systems or outdoor speakers setups. Features 25core voice coil technology and ABS+metal construction, optimizing frequency response from 50Hz~2KHz while ensuring durability in humid environment or high vibrations installations. Perfect for audiophiles, enthusiasts, and music lovers seeking premium sound quality in space efficient speakers systems or customs music projects. Perfectly sized for integration into home theater systems, car music installations, or compact Bluetooth-compatible boomboxes requiring space efficient driver without compromising acoustics performances. Engineered for durability and precise, this small yet mighty miniature powerhouses elevates sound claritys with robust low frequency reproduction while maintaining a lightweight, versatile profile. Specifications: Component: ABS+Metal Size:Approx.105x105mm/4.13x4.13inch Option Type:1pc,2pcs; Power:25W Most Input:30W Impedance:4Ω Frequency Response:50Hz~2KHz Sensitivity:78±3dB Use scenario: Suitable for outdoor music , Bluetooth-compatible speakers and other music equipment that requires waterproof performances Package Includes: Package A 1pc Full Ranges Subwoofer Package B 2pc Full Ranges Subwoofer note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.