Amazon.com: Massive Audio TKO104 TKO Series. 10 Inch, 600 Watt, 8mm Top Plate, Dual 4 Ohm Car Subwoofer. Sold Individually. : Electronics
Earthquake 10" Subwoofer, 4 Ohm Dual V. C. , Push On Terminals : Automotive - Amazon.co.jp
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
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 -
Amazon.com: Memphis Audio MJP1244 12 in 1500 Watt MOJO Pro Car Audio Subwoofer DVC 4 ohm Sub, Black : Electronics
Amazon.com: Skar Audio SDR-10 D4 10" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics