Amazon.com: SOUND TOWN 18" RAW WOOFER SPEAKER, 400 WATTS PRO AUDIO PA DJ REPLACEMENT SUBWOOFER LOW FREQUENCY DRIVER (STLF-1890) : Musical Instruments
Amazon.com: Sound Barrier SBNC18 2000 Watts Raw 18" Sub woofer Speaker Component Driver with 4 inch Voice Coil and Cast Aluminum Basket Pro Audio PA Cabinets - High Handling Power Heavy Duty :
Amazon.com: Gemini Sound ZRX-S18P 18" Inch Woofer Professional DJ PA Systems Active Powered Subwoofers with 1600W Watts Class D Digital Power, 3" Voice Coil, Line/Link in XLR Connectors : Musical Instruments
SoundLAB High Powered DJ Replacement Speaker (8 Ohm) - 18" inch 400W : Amazon.co.uk: Musical Instruments & DJ