Amazon.com: ASHATA 600 Watt Car Subwoofer, 6 Inch Car Speakers, 4 Ohms Car Subwoofer Loudspeaker Midrange Coaxial Speakers Black for Car Audio Systems : Electronics
JBL BASS PRO SL2 20cm active underseat subwoofer 125W RMS / 250W max. | eBay
JBL Stage 82 subwoofer 20cm - AutoHiFi-Ady
JBL Stage 82 - 20cm Subwoofer 200mm BASS Teller 800 Watt Auto KFZ 12V SUB PKW | eBay