i had another post on what enclosures work best in escapes. i may try and go another route as well. not sure how good of an idea it is with the power ill be putting to this single 15. the dimensions im working with are 18 high (potentially higher), 26 wide, 26 deep. theres certainly plenty of room to do a fourth order. i know that specs great depend on t/s, and ive got those but not on me at this time. i can tell you the fs is 34, and i intend to mostly use this enclosure for spl. if it sounds ok for daily, ill be happy with it. my main goal is a high score this year. the power ill be using will be close to 4600 watts from my two xsite xad2k amps strapped at 1 ohm. thanks in advance for any help. its been a long time since i built a fourth order, and it was pretty straight forward.