Monoprice Monolith THX Certified Ultra 2000W 16" Powered Subwoofer $1380 at eBay $1380 $2300 eBay with Monoprice has the Monoprice Monolith THX Certified Ultra 2000W 16" Powered Subwoofer (Matte Black/Painted, 42031) for $1380 with free shipping. Monoprice has it for the same price after code BIG25. $1380 retail: $2300 Report Posted by DrBatman03/05/2024 at 04:49 AM PT