is this tuned right ??

[Immacomputer 10+ year member]

That first one is 6.25 tuned to 38hz actually... not 44. The second design is 7 cubes at 37hz (actually closer to 36.75hz).

What are you actually looking for?

That's your port length and the shaded area is the area seen by the sub after port displacement. Multiply that area number by 21.75 and you have your net volume before sub displacement. After sub displacement, it's 7 cubes almost exactly. The length is about 26.25" after end correction.

 

[tRiGgEr 5,000+ posts]

Thank you for the detailed picture Immacomputer.

Pm sent elkiko

 

[elkiko2004 10+ year member]

thanks inmmacomputer for your help..i really apreciatte...thanks triger bro for ya help too....

 

[elkiko2004 10+ year member]

you guys think 126 sq of port would be all right for the 18'' btl ??

 

[tRiGgEr 5,000+ posts]

you guys think 126 sq of port would be all right for the 18'' btl ??

More in the range of 148-168...

But depending on how hard you actually push it daily. I highly doubt you will be listening to it daily @ full excursion, so you may be able to get away with 126 no problem.