American Sound Connection 312H Universal Large Car Trunk Triple 12" Sealed Subwoofer Rear Angle 3 Sub Box Stereo Enclosure and S-W12D2 Type S Series Sub Dual 2 Ohm 1200W Peak 12" Subwoofer
MISCO Speakers | 3" (77 mm), 4 Ohm Mini-Woofer
Samsung PS WA140E 3 ohm Subwoofer Speaker in Silver 8.25" x 13.75" x 14.5" | eBay
Subwoofer wiring diagrams
EasTech 6.5 inch Woofer, FSB52A065-6300, 3 ohm 100W, Sub from Philips SW-3410 | eBay
SW 3565 SUBWOOFER 3 Ohm | eBay
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