Ok i am questioning if this is wrong forum or not but here foes the question. If its wrong place forgive me but you guys are all about the TL here.

This is where my problem came up.....

http://www.diyaudio.com/forums/showthread.php?s=&threadid=56630

is the original post

I thought i had this TL thing licked math wise but apparently i was wrong ? I am putting this picture here and question so i can "visually' understand what was said to me in the above linked post. I dont understand how 70 odd inches applies to any driver as i said i n that post so if one of you can pick this picture apart and tell me where the math doesnt apply. I would appreciate it.

I have exhausted myself reading on the web on TL's and the theorys vary. I love a good problem, but not one with no consistent answer.

SO the picture example is like using two 8 inch woofers with a front firing port. I used the drivers combined Sd and 35 hz as a set point. Internal dimensions are 22 inches high 28 inches deep and 10 wide. You can move the inner walls in your head where your math takes you. But i am not getting 72 inches for the drivers Sd times the Frequency for a wave length (rough math, still like +/- 5 inches ).

Please help, i have half cut wood lying around for my morel 10 " and Planar project.

This is where my problem came up.....

http://www.diyaudio.com/forums/showthread.php?s=&threadid=56630

is the original post

I thought i had this TL thing licked math wise but apparently i was wrong ? I am putting this picture here and question so i can "visually' understand what was said to me in the above linked post. I dont understand how 70 odd inches applies to any driver as i said i n that post so if one of you can pick this picture apart and tell me where the math doesnt apply. I would appreciate it.

I have exhausted myself reading on the web on TL's and the theorys vary. I love a good problem, but not one with no consistent answer.

SO the picture example is like using two 8 inch woofers with a front firing port. I used the drivers combined Sd and 35 hz as a set point. Internal dimensions are 22 inches high 28 inches deep and 10 wide. You can move the inner walls in your head where your math takes you. But i am not getting 72 inches for the drivers Sd times the Frequency for a wave length (rough math, still like +/- 5 inches ).

Please help, i have half cut wood lying around for my morel 10 " and Planar project.