Skar Audio SDR-18 D4 18" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Automotive - Amazon.co.jp
Amazon.com: NVX VCW124v3 (VCW124 Version 3) 2400 Watt Peak (1200W RMS) 12" VC-Series v3 Dual 4-Ohm Car Subwoofer… : 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
Earthquake 10" Subwoofer, 4 Ohm Dual V. C. , Push On Terminals : Automotive - Amazon.co.jp
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 -
Amazon.com: CT Sounds TROPO-6.5-D4 400 Watts Max 6.5 Inch Car Subwoofer Dual 4 Ohm : Everything Else