How do you all know

[Eclipse GST 10+ year member]

I want to make a ported box for my Type R and i was thinking of about 33Hz but i have no idea how to make the port to make it 33Hz. how do u know which port sizes equal which Hz

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[tommyk90 5,000+ posts]

I want to make a ported box for my Type R and i was thinking of about 33Hz but i have no idea how to make the port to make it 33Hz. how do u know which port sizes equal which Hz

It's based on the size of the box, port area(width x height), and the length of the port