Speaker Features Speaker Type Subwoofer Peak Input Power 800W Rated Input Power 200W Speaker Size 300Mm Magnet Type Ferrit Terminals Silver Plated Screw / Slide Type Gasket Installation One-Way (Fixed) Installation Capabillity Sealed/ Ported Speaker/Woofer Specifications Peak Input Power 800W Maximum Input Power 400W Rated Input Power 200W Woofer Cone Material Injection P.P. Cone Speaker Basket Steel Speaker Surround Urethane Sensitivity 90Db/W/M Frequency Response 25Hz ~ 800Hz Subwoofer Impedance 4Ω X 1 Dimensions (W X H X D) 328 X 328 X 159.8Mm Mounting Depth 138.6Mm Mouting Hole Diameter Ø 277Mm Speaker Weight 3270Gr Gross Weight 4400Gr Weight Of Magnet 748Gr Subwoofer Parameters Nominal Impedance (Z) 4Ω Dc Resistance (Re) 3.7Ω Resonant Frequency (Fso) 28Hz Mechanical Q Factor (Qms) 9.49 Electrical Q Factor (Qes) 0.48 Total Q Factor (Qts) 0.457 Voice Coil Inductance (Lbm) 2Mh Voice Coil Diameter (D) 50Mm Force Factor (Bl) 12.8T/M Peak Excursion Xmax 4Mm Moving Mass (Mms) 109.9Gr. Volume Accoustic Compliance (Vas) 95.4Liter Piston Area (Sd) 0.048M² Displacement 3511Cc Sealed Box Volume 35.4Liter Sealed Box Dimensions 380 X 375 X 360Mm ( 21Mm Thick Mdf)(Wxhxd)