SUBWOOFER	ULTIMATE
	UW1258	UW1058	UW958
5.1" large External Voice Coil	√	√	√
Uniflow™ diecast aluminum chassis	√	√	√
Hexatech™ aluminum voice coil	√	√	√
EVC™ (external voice coil)	√	√	√
Paper cone	√	√	√
PFS™ - Progression Field Symmetry	√	√	√
spider/surround technology
DMM™ - Double Magnet Motor	√	√	√
high grade vented Ferrite magnets