OEM Specific boxes by Atrend are all U.S.A. made and are designed with the collaboration of Subwoofer Manufacturers. They have done all the work necessary to ensure your woofer delivers the best sound. From design to delivery, Atrend products are tested vigorously to ensure sound quality and accurate engineering. Working with only the latest in computer automated software and machinery. Atrend delivers quality results by utilizing only the most efficient engineering and manufacturing processes. Our subwoofer specific enclosures are engineered and constructed to be the strongest on the market.