DS18 PRO-BX21N.1 21" Neodymium Woofer 6000 Watts 6" 1-Ohm SVC Car stereo pro audio Audio car home system Subwoofers
BASSBOSS VS21-MK3 2,500-watt Single 21-inch Powered Subwoofer | Sweetwater
DS18 PRO-BX21N.2 21" Neodymium Woofer 6000 Watts 6" 2-Ohm SVC audio car home system Subwoofers
One unit (not pair) |21 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-21 – Lii Song (Lii Audio), unique speaker, amplfier, quality and cost-saving parts for HiFi DIY
9921b: 1500w to 2500w - 21 Inch Power Tuned Subwoofer - DD Audio