6.5 Inch 100W High Performance Active Heavy Subwoofer Speaker Arbitrary Connection of Active Speakers - China Speaker and Subwoofer price | Made-in-China.com
My homemade (almost) 6 inch subwoofer (made entirely with a desk found on the side of the road and free speakers) : r/diyaudio
6 Inch Subwoofer Speaker Iron Frame 35 Core, 120mm Magnetic Subwoofer Speakers 4ohm Stereo Audio Loudspeaker
Classic CESR 6 INCH SPEAKER SUB WOOFER 50W 120 W Tower Speaker