One unit (not pair) |15 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-15 - Lii Song (Lii Audio), unique speaker, amplfier, quality and cost-saving parts for HiFi DIY
JBL PRX915 15-inch Powered Loudspeaker and PRX918XLF 18-inch Powered Subwoofer PA Bundle | Sweetwater
Professional PA System with 15-inch Speakers, 18-inch Subwoofers, Amplifier – Sound Town
Amazon.com: 5 CORE 18 Inch Subwoofer Speaker 850W Peak High Power Handling 500W RMS 18" Replacement 8 Ohm Pro Audio DJ Sub Woofer w/CCAW Voice Coil Aluminum Frame 97oz Magnet FR 18
Amazon.com: Sound Town 15” 500W Cast Aluminum Frame Woofer (Low Frequency Driver), Replacement Woofer for PA/DJ Speakers or Subwoofer Cabinets (STLF-15120A) : Electronics
12in vs 15inch vs 18inch Subwoofers Whats the Difference? - YouTube