Product SKU: 37709 ID: hfx12d4. Hifonics HFX12D4. 800W Peak (400W RMS) 12" HF Series Dual 4-ohm Car Subwoofer. 12" Dual 4 ohm HF Series Subwoofer. Subwoofer Specifications. Every subwoofer needs a subwoofer box.
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