Amazon.com: Technical Pro - 18" Raw Subwoofers/Woofers/Speakers - PA DJ Pro Audio Replacement Sub - 1000 Watts RMS - 80 oz Magnet - 8 Ohms - 3" ASV Voice Coil : Electronics
JBL SRX828SP 18 Inch Dual Self-Powered Subwoofer System - SRX800 Series - Akwil Ltd
18″ Platform 2 – PSI Car Audio
Sub-18R - DAS Sub-18R - Audiofanzine
Amazon.com: Mackie THUMP Series, 18-Inch 1200-Watt Subwoofer with Professional band-pass design Dual XLR inputs Stereo high-pass and Stereo full-range outputs - Black (THUMP18S) : Musical Instruments
DAS ACTION-S18A 18" Active Subwoofer, 750W | Full Compass Systems
Behringer B1800XP 3000W 18 inch Powered Subwoofer | Sweetwater