HiFonics 12" inch HA-112A Alpha Powered Subwoofer System – Hot Beat Electronics
HFX12D4 HFX 12 Inch 4 Ohm DVC Subwoofer | Hifonics
Amazon.com: Hifonics THW12D4 Zeus Theta Series 1000 Watt Max 500 Watt RMS 4 Ohm 12 Inch Car Audio Subwoofer with 2.5 Inch Dual Voice Coils, Black : Electronics
2) Hifonics Hfx12d4 12" 1600w Car Audio Dvc Subwoofers Power Bass Subwoofers : Target