Amazon.com: Skar Audio SDR-10 D4 10" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Tieftöner 20cm (8") 4 Ohm : Amazon.de: Elektronik & Foto
Amazon.com: Car Vehicle Subwoofer Audio Speaker - 6.5 Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 600 Watt Power, Foam Surround for Vehicle Stereo Sound System - Pyle PLPW6D : Electronics
Amazon.com: American Bass HAWK 15 Inch Dual 4 Ohm Voice Coil 3000 Watt Subwoofer Speaker with 80 Ounce Magnet and Kevlar Fiber Non-Pressed Paper Cone, Red : Electronics
Amazon.com: Skar Audio EVL-65 D4 6.5" 400 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics