Audiofrog GB12D2 GB Series 12" dual 2-ohm subwoofer at Crutchfield
GB SUBWOOFERS Archives - Audiofrog
Amazon.com: Pair of Gravity 15 Inches Car Audio Subwoofer 3200 Watts Peak Power (1600x2) RMS Power 80 Watts Each with Dual Voice Configuration 4 Ohm Power (2 Woofers) : Electronics
Audiofrog 12" GB Dual 4 Ohm Mobile Subwoofer - GB12D4