Unit diameter: 4 inches Impedance: 4??. 8 ?? Rated power: 40W Maximum power: 50W Peak power: 100W Frequency response:?65Hz-3500Hz Sensitivity: 88dB Qts: 0.42 Box volume: 5.6L Maximum outside diameter: 116mm? Diagonal screw hole: 105-108mm? Speaker height: 65mm Speaker hole size: 93mm Cone Material: Cotton Paper + Hemp Net Weight:760g/PCS Features: 1. very suitable for the production of 2.1 speakers subwoofer unit and two-way Crossover?speaker woofer, 2. The cone is added with flax and bamboo fiber, the suspension is made of rubber and foam composite material, the real long-stroke, high-power design, 3. The use of strong magnetic circuit system, air back flow system to ensure that the work in the high-power long stroke, bass clean, strong, fast. Low-frequency full of flexibility, used to upgrade the computer speaker subwoofer is also a good choice, 4. Because of the high sensitivity, 25W-50W can easily push. Is a very rare bass unit. Material and?Design ?? 1. True sense of high power long stroke design 2. With cotton and linen fiber pulp, bass fluffy and soft 3. Large-scale imports of A-level rubber side 4. Powerful dynamic range, with a powerful magnetic circuit system 5. Full convection design, air resistance to a minimum 6. Independent acoustic abrasive design