Amazon.com: Audiopipe TXX-BD2-12 12 Inch High Performance 1500 Watt Max Power Car Audio Subwoofers with Dual 4 Ohm Voice Coil (2 Pack) : Electronics
Amazon.com: Skar Audio SDR-10 D4 10" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: Massive Audio TKO104 TKO Series. 10 Inch, 600 Watt, 8mm Top Plate, Dual 4 Ohm Car Subwoofer. Sold Individually. : Electronics
Amazon.co.jp: PowerBass S84 S-Series 8-Inch Single 4 Ohm Subwoofer by PowerBass : 家電&カメラ
Amazon.com: Pyle Car Subwoofer Audio Speaker - 8in Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 800 Watt Power and Foam Surround for Vehicle Stereo Sound System -
Electronic Spices Bluetooth 4 inches Max Subwoofer Speaker 4 ohm 30 Watt HiFi Woofer Deep Bass, Multicolor : Amazon.in: Electronics
Amazon.co.jp: BOSS Audio Systems R1100M Riot Series Car Audio Subwoofer Amplifier - 1100W High Output One-Piece Cast A/B Grade Stable 2/4 Ohm Drive Low/High Level Input Low Pass Crossover MOSFET Power Circuit
Amazon.com: Massive Audio GTX154 – 15 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 15" Subwoofer 700 Watt RMS, 1400w MAX Dual 4 Ohm, 2.5 Inch Voice Coil. Sold Individually : Electronics
Amazon.com: CT Sounds Hydro 12 Inch Car Subwoofer 600w RMS Dual 4 Ohm : Electronics
Amazon.com: Pyle PLPW15D 15" 8000W Car Subwoofer Audio Power Subs Woofers DVC, 2 Pack with Black Steel Basket, Non Press Paper Cone and 4 Ohm Impedance : Electronics