Amazon.com: CT Sounds TROPO-6.5-D2 400 Watts Max 6.5 Inch Car Subwoofer Dual 2 Ohm : Everything Else
JBL Club A600 High Performance Compact Class D Car Audio Mono Subwoofer Amplifier Bundle Combo with Infinity Reference 1000S 10" 800 Watt Peak Power Shallow Mount Car Audio Subwoofer - Road Entertainment
Harman Kardon 25PF12DZB-DW02-E Replacement 10" woofer-TS11 SYSTEM | eBay
Amazon.com: CT Sounds TROPO-6.5-D4 400 Watts Max 6.5 Inch Car Subwoofer Dual 4 Ohm : Everything Else
JBL Harman Kardon Stadium 102SSI 10 Inch Subwoofer Car Set - Powerful 1350 Watt Car Bass Box Car Speaker - 30 Hz - 175 Hz - 250 mm with SSI Impedance Switch : Amazon.de: Electronics & Photo