Ok, now let me ask you a question about this TYPE of box....if you want a box that has every acoustical charicteristic, do you have any idea how much that would cost you...and how much money you would be wasting...because the difference in sound would be barely even audible.......you can even ask mark...I requested a TCAB from him...I wanted it re-enforced, and 45 DEG. on all corners and edges and seems so there were absolutely no 90 DEG parts in the entire box....because ACOUSTICALLY that is the best for a box. FROM EXPERIENCE AND TESTING...he told me that for the extra time and money it would cost it wasnt worth it because to the mic...it barely makes a diff....if any at all.
NOW...when i went to school we designed a box that was re-enforced to the point where you look in the box, and there is basically a basket made of wood to fit the sub, wit all 45deg corners for 2 10" L7's....they sold it for 500 bucks!!!!!!
So you go ahead and pay all that money for your "acoustically correct" built box....
now on the other hand....most shops do charge 200+ or close enough to that for a WELL DESIGNED dual 12" or dual 15" ported box....id say maybe 1 in 10 boxes that I hear from local shops can get as loud as a TCAB.....but the diff is these local shops have to put in good effort to get as loud as a TCAB for AS class competition...aka street beater.......now put your general local shops competition box against a TCAB competition box for just SPL...designed for SPL.....obviously,,,the reigning world champ would probably win..
AND WHY DO ALL YOU HATERS TALK TOOOO MUCH TRASH......YET DONT BACK IT UP!!! LETS SEE SOME NUMBERS BICHES!!