W3BL4Z3D4NK Posted April 3 Report Posted April 3 Was planning on building this box to fit in my 4runner with the sub up and port facing back. I ran all the same numbers in winisd and it shows a different port length requirement for the desired 35hz frequency. Now I'm not sure which one is correct. Any help here would be appreciated. Quote
Joe X Posted April 5 Report Posted April 5 Clearly you don't know how to use the calculator. Your port area is low also at 36 square inches, should be around 50 squaw inches, check with sundown. The port length in win isd is for non slotted round ports so for a slotted ports that is mainly why you see a difference. Quote
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