Alpine SWS-1043D Type-S 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: Alpine Bundle Compatible with Universal Car S-W10D4 10" Subwoofer Dual 4 Ohm with S-A60M Class D Subwoofer 1200W Amplifier, and HA-AK4 Amplifier Install Kit : Electronics
Alpine S-W10D2 | 1800 Watt S-Series 10" Car Subwoofer
Alpine S-W10D4 S-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine SWS-10D2 Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield