I need 2.5 cubes @ 33Hz. The box will be 15Hx36Wx12.5D with 3/4mdf which should net 2.96cuft.Displacement 0.14cuft. Now the problem! Can anyone tell me what tune the box will have if I go 2.5Wx14L?? I think I am way off here. After adding .75 to the ports width for the wood wall I finished with 2.47cuft. Which is pretty close to the 2.5cuft goal. I am open for suggestions with the whole box and can trash the 15h x 36w idea. Also, would be great if I knew the exacts for finding a ported boxes tune in standard. Thanks for any ideas and help in advance.