Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 8-ohm (STLF-1504-8) : Musical Instruments
Amazon.com: Pyle 8 Inch Car Midbass Woofer - 360 Watt High Powered Car Audio Sound Component Speaker System w/High-Temperature Kapton Voice Coil, 200Hz-5kHz Frequency, 94 dB, 8 Ohm, 35 oz Magnet - PDMR8 : Electronics