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View Full Version : Port length question with WinISD



GregU
06-24-2009, 10:43 PM
I'm designing a box with WinISD and I've never had to build a box with more than one port, brings me to a question.

I have to have 2 ports to keep the mach down, port dimensions are 2" x 5" ID. WinISD says that the port length would need to be 39" long. Now, does that mean that each port would need to be 39" long or 19.5" long for each port to total 39"?

This is for an IDMAX 10" = 1.75ft3 @ 27Hz

RAM_Designs
06-24-2009, 10:45 PM
for each

GregU
06-24-2009, 10:48 PM
for each

That's fu*ked up:verymad:

So whats the advantage of multiple ports?:confused:

RAM_Designs
06-24-2009, 10:50 PM
That's fu*ked up:verymad:

So whats the advantage of multiple ports?:confused:

None, it's better/easier to do a single larger port that doesn't have to be quite as long as two smaller ports.

GregU
06-24-2009, 10:55 PM
None, it's better/easier to do a single larger port that doesn't have to be quite as long as two smaller ports.


Well, shiet.......

Kinda hard building a box so small with such a low tune.

On ID's website they say on a 1.68ft3 @ 25Hz to make a port 3" I.D. x 17.75" long....... which is WAAAAAYYYYYY off from what WinISD says.:confused:

Well, not way off but the mach is like .24 which would whistle pretty **** bad