6.5" Subwoofer Dual 4 Ohm 500 Watts Max Car Audio Sub Audiopipe TXX-BDC4-6 - Walmart.com
Subwoofer Shocking Bass unit 4.5 inch 6 ohms Hi Fi Audio Speaker 40W Stereo Loudspeaker Woofer Speaker for DIY speakers|speaker 40w|speaker forspeaker speaker - AliExpress
6 inch subwoofer at Crutchfield
Audiopipe 6" Woofer 150W Max 4 Ohm DVC Sold Each : Electronics
MESO-6-5 - 800 Watt Max 6.5 Inch Car Subwoofer - CT Sounds
Massive Audio Massive GTX Series 6-Inch 250-Watt-RMS Dual 4-Ohm Subwoofer Black Black GTX 64 - Best Buy