PYRAMID WX65X 6.5" 300 Watt Car Audio Subwoofer Sub Power Woofer 4 Ohm - Walmart.com
Abaca Audio 4 Inch High-End Shielded Woofer 4 ohm: perfect for replacing/upgrading or building bookshelf, surround, sound bar speakers, or other diy speaker projects.
2 Ohm Vs 4 Ohm Subwoofers - Which Is Better?
How to Wire Two Dual 4 ohm Subwoofers to a 4 ohm Final Impedance | Car Audio 101 - YouTube
Ghxamp 4 Inch Woofer Subwoofer Speaker Unit Hifi 4ohm 40w Fiberglass Woven Basin Deep Bass Loudspeaekr Large Magnetic 1pc - Speakers - AliExpress