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Pioneer TS-A2000LB Passive Subwoofer, Powerful Enclosure Subwoofer with 700 W Maximum Power, 20 cm, IMPP Membrane, Black, Continuous Output Power 250 W : Amazon.de: Electronics & Photo
Amazon.com: (2) Kicker 48CWR122 COMPR12 2000 Watt 12" Car Subwoofer Bundle with Rockville RD12 Sealed Subwoofer Enclosure Sub Box & Dual Sub Box Enclosure Installation Kit (3 Items) : Electronics
Amazon.com: Sound Storm Laboratories PB8 Car Subwoofer and Amp Package – Built-in Amplifier, 8 Inch Subwoofer with Passive Radiator, Remote Subwoofer Control : Everything Else
Hifonics TD-200R Passive Car Subwoofer : Amazon.de: Electronics & Photo