B&C 21DS115-4 21" Neodymium Subwoofer 3400 Watts Program 4.5" Coil 4-Ohm Pro Sub | Reverb
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