slot port box design end correction and port correction forumlas

[pwnt by pat 10+ year member]

I'm working on an excell spreadsheet that when you punch in a few values, designs a box for you. I just need to know the two following equations, if anyone can help me:

1) end correction values: flared external port and rounded internal walls, as well as port next to box wall values

2) oprt correction values for angles/molding in the corners to help smoothe airflow

thanks

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