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: 1.34cu ft Ported Enclosure Box Volume: 1.57cu ft Box Tuning: 38 Hz Port Area: 12.57 sq in Port Length 15 in Specifications Description