Pioneer 12" PRO Series Subwoofer Dual 4 Ohms Voice Coil - TSW1200PRO – Sweetheart Deals
Best Buy: Pioneer Champion Series PRO 10" Dual-Voice-Coil 4-Ohm Subwoofer TS-W2502D4
Pioneer TS-300D4 Champion Series 12" Dual 4 Ohm Car Audio Subwoofer 1400W Max - Walmart.com
Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer - Walmart.com
Pioneer TS-W312D4 | Car Entertainment, Subwoofers, Champion Series Subwoofer, Champion Series Red Subwoofer | Pioneer Middle East - Car Stereo, Car Subwoofer, Amplifier
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Pioneer TS-A2000LD2 Shallow-mount 8" subwoofer with dual 2-ohm voice coils at Crutchfield