https://www.monoprice.com/product?p_id=42031&AID=11051853&PID=4485850&ref=cj&utm_source=cj&utm_medium=affiliat 16" Monoprice Monolith THX Certified Ultra 2000 Watt Powered Subwoofer (Matte Black/Painted) on sale for $1699.99 when you apply promo...