Audiopipe, 18" Pro Audio Woofer, 8 Ohms 1800 W Max, 200 Oz Mag, 4" Voice Coil 18" Pro Audio Woofer, 8 Ohms 1800 W Max, 200 Oz Mag, 4" Voice Coil

Audiopipe, 18" Woofer 3400W Quad Stack Dual-2 Ohms 18'' Woofer 3400 Watts Max 340oz Magnet, Dual 2-Ohm Quad Stack

Audiopipe, 18" Quad Stack Subwoofer Dual 4 Ohms 18'' Quad Stack 3400 Watts Max, Subwoofer, 340 Oz Magnet 2-Ohms -