SuperNova MKVI 12" - The ultimate bass experience – down to 15 Hz. - EarthquakeSound.eu
AudioPipe Sub-BDC4-15D2 15-Inch Sub Dual 2 Ohm 1400 W RMS Car Audio (2 Pack) - Walmart.com
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
Audio System H 15 EVO 380 MM Spl Power-Subwoofer 15500 Watt Peak At 60 Hz | eBay