STLF-1804-4 | 18" 450W Raw Woofer Replacement Speaker, 4" Voice Coil, 4-Ohm – Sound Town
Sweton Speakers - Order Online
STLF-1504-4 | 15" 450W Raw Replacement Woofer w/ 4" Voice Coil for Subwoofers – Sound Town
MB Quart DS1-204 400 Watt 8 Inch Shallow Slim DVC 4 Ohm Car Sub, Single Speaker - Walmart.com
One Pair | 4 Inch Full Range Speakers | Desktop and Bookshelf Solution | Al- 4 - Lii Song (Lii Audio), unique speaker, amplfier, quality and cost-saving parts for HiFi DIY
2PCS 4" Subwoofer Woofer High Power Speaker Long Stroke 4Ohm Round Speakers | eBay