Port length... confused

[jdawg90 10+ year member]

using winisd i get a different port lenght for 4 4" ports than i do for 1 8" port... why is this? Its the same port area...

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[dman4486 5,000+ posts]

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[jdawg90 10+ year member]

well im using the stickied design a ported box thing and it says to get the port length in winisd then it tells me to add port displacement to the net volume to find the last side...

i wouldnt need to add the port displacement if winisd alreayd calculates it right?

shit im confusing myself

 

[jdawg90 10+ year member]

and shit the port displacement for 4 4" at 4" lenght is the same as 1 8" at 4" lenght...