Optimized for small enclosures, EFX Competition subwoofers are bigger and stronger than ever. Beefy 2.5" Ultra-High temperature voice coils, heavy double stacked magnets and the large vented pole piece make up a motor structure that handles more power and plays louder than any EFX woofer before. With woven tinsel leads, heavy duty push terminals, stitched and bonded large rubber surrounds and one piece IMPP parabolic cones the EFX Competition subwoofers deliver!