Amazon.com: 5Core 8" Inch Subwoofer Replacement DJ Speaker Car Loudspeaker 100W 4 Ohm WF 8110G : Electronics
4" Inch 4Ω 40-100W Subwoofer Woofer High Power Long Stroke Speaker Loudspeaker 7678529531775 | eBay
Amazon.com: PRV AUDIO 6.5 Inch Speakers Midbass Woofer 6MB200-4 v2 200 Watts Program Power, 4 Ohm, 100 Watts RMS, 1.5 in Voice Coil, Perfect for Small Custom Enclosures for Pro Car Audio
Sound Ordnance™ B-8P-120 100-watt powered bandpass subwoofer at Crutchfield
Aiyima 1pcs 4 Inch Subwoofer Speaker 100w 4 8 Ohm Super Woofer Sound Speaker Bass Waterproof Loudspeaker Diy 2.1 Home Theater - Speakers - AliExpress
BOSS Audio Systems P80DVC Phantom Series 8 Inch Car Audio Subwoofer - 100 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck, Boxes and Enclosures, Use With Amplifier - Walmart.com