Thanks to community member vajratlr & Adam1813 for finding this deal.
12" Woofer Features:
THX Ultra Certified: THX engineers completed hundreds of different scientific tests to ensure the highest audio performance possible.
THX Certified Ultra products are for large sized rooms, up to 3,000 cubic feet in size, with a 10-12 foot viewing distance from the screen.
12 inch Woofer: Enclosed in a cabinet made from HDF material, massive internal bracing, and outfitted with dual ports that can utilize a foam plugs to run the subwoofer in a sealed mode.
500 Watt Amplifier: Each amplifier's transfer function, power output limiting and thermal protection are monitored to the millisecond and are customized for each individual driver.
The high efficiency Class D amplifier modules are based on a proven topology that has been continuously refined over the past 4 years. The amplifier has vast reserves of power for highly accurate, deep bass for your home theater or music system.
The following is no longer available
Monoprice via Target also has select Monolith by Monoprice THX Ultra Certified Subwoofers on sale listed below. Shipping is free.