15 VS 12 Inch Subwoofer: What's the Performance Difference?
12in vs 15inch vs 18inch Subwoofers Whats the Difference? - YouTube
Amazon.com: 5 CORE 18" Raw 850W Peak Sub Woofer Cast Steel Basket Driver for Pro Audio PA DJ Cabinets Subwoofer with High Handling Power 500W RMS Extremely Clear and Loud Replacement Speaker
Amazon.com: Sound Town 15” 500W Cast Aluminum Frame Woofer (Low Frequency Driver), Replacement Woofer for PA/DJ Speakers or Subwoofer Cabinets (STLF-15120A) : Musical Instruments