i built that enclosure for a friend about 8 month ago, it hit the low with out bottoming out and it went pretty flat till 120Hz nice and loud. just had to play a little bit with the EQ to get it right, is not an spl system for sure, but for sq was great. and it got loud. he sold that system and is saving up for another one design and built by me. for a dual 12" type r set up. may be this time well go for an spl system.