JENSEN J12W 12" 1200w 4-ohm Car Audio Subwoofer+Vented Sub Box Enclosure - Walmart.com
Small Mini Audio Speaker Speaker 4 ohm 3W With Cable 10cm 20cm 30cm 40cm 50cm | eBay
Crunch CRW12D4 12 Inch 800 Watt MAX 400 Watt RMS 4 Ohm Dual Voice Coil Car Audio Subwoofer Speaker with Spade Terminals for Sealed or Vented Enclosure | Car subwoofer, Subwoofer speaker, Subwoofer