Amazon.com: JINGERL 4 Inch Subwoofer Speaker 8Ohm 30W Woofers for Speakers Bass Anti Magnetic Bass HiFi Loudspeaker Car Audio Home Theater DIY 2Pcs (Size : 2pcs) : Electronics
DIY subwoofer I built. 12-in Dayton UM subwoofer and a 500 watt bash amplifier. Flat port design tuned to 20 hz. : r/hometheater
Amazon.com: 4.5 Inch Megabass Audio Speaker 50W 4Ohm Car Subwoofer Long Stroke Deep Bass Loudspeaker DIY Home Theater Woofers for Speakers (Size : 1 Piece) : Everything Else