Dual 8'' T-Line Subwoofer Box ??

[promaxrs]

Hello to all !
Im looking for original 8'' T-Line Subwoofer plans.
Have tried a search but cant find it anywhere, can someone point me in the right direction.

Thanks!!!
Here is link - YouTube - 8" Subwoofer T-line - Progress

 

[Bluto]

+1

 

[Ibex]

May I refer you to this thread:

T-line dual 8" subwoofer build! - Home Theater Forum and Systems - HomeTheaterShack.com

...seems to be a trail-and-error design