2x EMINENCE DELTA PRO-18A Hi-Quality 18" Pro Sub Woofer 8-Ohms 1000W PA Speaker
Amazon.com: Alphasonik 18" Flagship Series 3000 Watts Raw Sub Woofer Speaker Cast Aluminum Basket Driver for Pro Audio PA DJ Cabinets Subwoofer with High Handling Power Extremely Clear and Loud - FW1832 :