Key Features 300Mm Carbon-Glass Fiber Honeycomb Cone Subwoofer Super Linear Spider Smooth Linear Surround Heat Transfer Structure Shallow Mount Speaker Features Speaker Type Subwoofer Peak Input Power 1400W Rated Input Power 350W Speaker Size 300Mm Speaker Cone Design Carbon-Glass Fiber Honeycomb Cone Magnet Type Ferrit Terminals Silver-Plated Push Type Heat Transfer Motor Circuit Yes Magnet Cover Aluminum Die-Cast Basket Gasket Installation Two-Sided Installation Capabillity Sealed/ Ported Speaker/Woofer Specifications Peak Input Power 1400W Maximum Input Power 700W Rated Input Power 350W Woofer Cone Material Carbon-Glass Fiber Honeycomb Cone Speaker Basket Aluminum Die-Cast Speaker Surround Rubber Spider Type Super Linear Spider Sensitivity 91Db/W/M Frequency Response 30Hz ~ 800Hz Speaker Impedance 4Ω Dimensions (W X H X D) 325 X 325 X 121Mm Mounting Depth 100Mm Mouting Hole Diameter Ø 279Mm Speaker Weight 7000Gr Gross Weight 8000Gr Weight Of Magnet 1370Gr Subwoofer Parameters Nominal Impedance (Z) 4Ω Dc Resistance (Re) 3.2Ω Resonant Frequency (Fso) 24.8Hz Mechanical Q Factor (Qms) 2.897 Electrical Q Factor (Qes) 0.67 Total Q Factor (Qts) 0.544 Voice Coil Inductance (Lbm) 2.8Mh Voice Coil Diameter (D) 65Mm Force Factor (Bl) 12.93T/M Peak Excursion Xmax 8.5Mm Moving Mass (Mms) 224Gr. Volume Accoustic Compliance (Vas) 62.685Liter Piston Area (Sd) 0.049M² Displacement 1740Cc Sealed Box Volume 22.6Liter Sealed Box Dimensions (Trapezium Shape) 773 X 362 X 107 X 172Mm ( 21Mm Thick Mdf)(Wxhxd1Xd2) Vented Box Volume 22.6Liter Vented Box Dimensions (Trapezium Shape) 773 X 362 X 107 X 172Mm ( 21Mm Thick Mdf)(Wxhxd1Xd2) Vented Box Port Diameter/Length Ø 76Mm / 102Mm