Monoprice Monolith M-12 V2 12in THX Certified Ultra 500 Watt Powered Subwoofer, Massive Output, Low Distortion, Vented HDF Cabinet

THX Certified Ultra: THX engineers completed hundreds of different scientific tests to ensure the highest audio performance possible. The tests ensure the speaker can reach the high volumes necessary to achieve THX Reference Level without creating audible distortion or artifacts. 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