* Parabolic Polypropylene Cone * Unique Foam Blend High Roll Surround * Bumped Back Plate For Maximum Excursion * Vented Pole Piece for Extended Play Time * Power Handling: 1000W. * Sensitivity (dB @ 1W 1M): 85.5dB. * Mounting Diameter: 10.82" (275.0mm). * Mounting Depth: 5.23" (133.0mm). * Sealed Enclosure Volume: 0.88 (ft3) 53 / .71 (Hz). * Vented Enclosure Volume: 1.25 (ft3) 40 / 35 (Hz). * Vent Dimensions: 4" x 16.5" / 101.6mm x 419.1mm.