STLF-1804-8 | 18" 450W Raw Woofer Replacement Speaker, 4" Voice Coil, 8-ohm – Sound Town
Amazon.com: Sound Town 18" 500W Cast Aluminum Frame Woofer (Low Frequency Driver), Replacement Woofer for PA/DJ Subwoofer Cabinets (STLF-18120DR) : Electronics
Eighteen Sound 18NLTW4500 - 18″ Subwoofer
G18-Sub - Coda Audio
Amazon.com: Seismic Audio - 18" Raw Subwoofer/Woofer/Speaker - PA DJ Pro Audio Replacement : Musical Instruments
B & C Speakers 18 in. 3400W Power Soft Woofer - Walmart.com
Did You Know: A Rotary Subwoofer can Reproduce a Tiger's 18 Hz Roar | B&H eXplora
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
Behringer | Product | DR18SUB
Procella V18 subwoofer low frequency performance to 11Hz.
4 x B&C 18TBX100 18" Low Frequency 2400W Subwoofer 8-Ohms 97.0 dB 35 - 1000 Hz