ALDS Technology SPV Technology CET Technology Spider with interlaced tinsel leads Original MTX die cast alluminium frame Glass fiber cone Stitched cone to surround Butyl rubber surround �60mm high temp (220�) aluminium voice coil Tripple stacked magnets High-end, heavy duty terminals designed by Streetwires Works in small sealed and bassreflex enclosuresBuild like the original MTX Jackhammer the T8000 round is the real baby brother of �Jack�. BASS is the game here and this sub works very well in both sealed and vented enclosures.