Best Buy: Dual 12" Single-Voice-Coil 4-Ohm Subwoofer DS12
Sub 12 dual - Subwoofer | Focal
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Dual Electronics DWS12 12-inch High Performance Subwoofer with a 2-inch Single Voice Coil and 1,000 Watts of Peak Power - Walmart.com
Amazon.com: Dual Electronics SBX212i 12-inch illumiNITE High Performance Studio Enclosed Subwoofers with 1,200 Watts of Peak Power & 41-Ounce Magnets : Electronics
Dual Electronics - 12" Subwoofer - DWS12
ROCKFORD FOSGATE R2-2X12 Subwoofer Dual-Subbox Premier 30 CM (12 ") 500 Watt RMS EUR 341,37 - PicClick FR