Lightning Audio L1-S410 10" 4-ohm subwoofer at Crutchfield
Best Buy: Lightning Audio 10" Single-Voice-Coil 4-Ohms Subwoofer P3.10.4
LIGHTNING AUDIO LA-L2-D410 [More Than Price Realized A Heavy Bass Reproduction LA-TWO Series Former Having Excellent Cooling Of The Voice Coil] Ys Corpore | Sub Woofer Speakers | Croooober
Lightning Audio S4.12.4 (s4124) 12" Single 4 ohms Subwoofer