Pair of SEISMIC AUDIO 18" PA POWERED SUBWOOFER Active Speakers 800 Watts Each | eBay
Seismic Audio Tremor 18 Subwoofer System, 500 W RMS, Black - Walmart.com
Amazon.com: Seismic Audio - Package - Two 18 Inch PA Subwoofers PRO Audio Band Speaker Cabinets Sub - Band, Bar, Wedding, Karaoke, DJ, 18" Cabs 1000 Watts RMS : Musical Instruments