18 Sound 18LW2600 18" Woofer 3000W 8-Ohm Designed For Use In Vented Enclosures
18 Sound 15LW2400 speaker, 4 ohm, 15 inch
Amazon.com: 18 Sound 12MB1000 12" Woofer/8OHMS/1200W - Set of 1, Black : Electronics
Eighteen Sound 15LW1401 - 15" 1,000 Watts AES High Power Woofer
Eighteen Sound 18 Sound Speaker 10W402 10 Inch Woofer Speaker NEW | eBay
18-in next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration - Walmart.com
Test Bench: Eighteen Sound 18iD 18-Inch Woofer | audioXpress