Port calculator w*h
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Joined: Feb 2006
Posts: 16,860
In your drawing, the virtual port line would extend from the end of the inner wall up and to the left to the outer wall at a 45deg angle.
If you need a vent that is 20" long, and the vent is 6.2" wide, then cut the inner wall 3.1" shorter, ie 16.9" long.
If you leave the inner wall at 20" long, then the vent will, theoretically, behave like it is 23.1" long.
If you need a vent that is 20" long, and the vent is 6.2" wide, then cut the inner wall 3.1" shorter, ie 16.9" long.
If you leave the inner wall at 20" long, then the vent will, theoretically, behave like it is 23.1" long.
Does the 12volt calculator calculate for half the port width? Meaning, should I calculate it as 20" long, then make it shorter for what it calculated and expect the same tune? I want it at an actual 34.9 HZ.
I change one thing and everything else changes >.<
I change one thing and everything else changes >.<
Last edited by Lord Huggington; Jul 29, 2010 at 03:42 PM.
There's a lot more to it than people think.
Administrator
Joined: Feb 2006
Posts: 16,860
LEFT, not right. Sorry about that - my bad..
Calculate it as 20, then shorten it when you build the box. Bear in mind though that nothing you do with a calculator or computer program will get that box tuned to 34.9hz. There are simply too many variables. The only way to tune to a *specific* frequency is to test it and re-tune after the fact.
Calculate it as 20, then shorten it when you build the box. Bear in mind though that nothing you do with a calculator or computer program will get that box tuned to 34.9hz. There are simply too many variables. The only way to tune to a *specific* frequency is to test it and re-tune after the fact.
