Amazon.com: Replacement 18" Woofer for Yorkville 7420, 7459 for LS608, LS800P, LS801P, TX9 Speaker 8 Ω : Electronics
Amazon.com: Sound Town 18” 800W Cast Aluminum Frame Woofer (Low Frequency Driver), Replacement Woofer for PA/DJ Subwoofer Cabinet (STLF-18200A) : Electronics
Amazon.com: Sound Town 18” 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 4-ohm (STLF-1804-4) : Musical Instruments