please check my port calculations

[pwnt by pat 10+ year member]

So, I'm trying to learn the whole design thing. Please check the calculations for my ports:

4 cubes:

port diameter = 4"

tuning = 22hz

port length = 37cm (14.567in)

3 cubes:

port diameter = 4"

tuning = 75hz

number of port = 2

port length = .75"

thanks,

pat

edit: also, when running the port along a wall, I know the port gets extended at a triangle, but how is the value for that lenght derrived? is it the length of center of port to center of hypotenuse?

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