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: 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2 Inch
Tieftöner 20cm (8") 4 Ohm : Amazon.de: Elektronik & Foto
Dynavox 165mm Basslautsprecher 4 Ohm, kompaktes Bass-Chassis mit Gummi-Sicke für Selbst-Einbau in Boxen-Gehäuse, für Mittel-und Tieftonwiedergabe, Schwarz, 204206 : Amazon.de: Elektronik & Foto
Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
Amazon.com: Audiopipe 6" Woofer 150W Max 4 Ohm DVC Sold Each : Electronics