Features 2.5" High Temperature Voice coil Compressed Paper cone Double stitched foam surround High Excursion Foam Surround Die-cast aluminum vented basket Proprietary Full Round PVC Gasket Heavy Gauge Spring Terminals Protective magnet cover Sealed enclosure Box Volume: 2.82cu ft Ported Enclosure Box Volume: 2.96cu ft Box Tuning: 35Hz Port Area: 19.63sq in Port Length 11in Specifications Description