Simple question about WinISD - port length - diyAudio
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Old 25th April 2011, 05:18 PM   #1
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Default Simple question about WinISD - port length

Hi DIY'ers.
I've designed a box with WinISD pro alpha and it gives me a port length.
I've made the box with 22 mm wood and have cutted the place for the port. Does the 22 mm thickness counts as some of the port length? It's because I'm going to start the port from the inside of the box (It's a large square hole) to make it easier to make the port.
Hope my question makes sense... didn't now how to explain it.


Simon H.A.
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Old 25th April 2011, 05:25 PM   #2
GM is offline GM  United States
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Location: Chamblee, Ga.

Correct, subtract 22 mm from the total vent length. With a fixed design such as yours that's not easy to change, hope you used the projected power limit to sim with otherwise your vent may be way too small for good performance at high SPL and got the tuning close enough to perform well in room.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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Old 25th April 2011, 06:06 PM   #3
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Thanks for you answer!
I'll think it will do fine since WinISD only says that my port will get to 17 m/s (Mach 0.05) at full power.


Simon H.A.
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Old 25th April 2011, 07:43 PM   #4
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redo the simulation with the extra 22 mm added to the port, it may happen that it makes no major difference at all.
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Old 25th April 2011, 07:47 PM   #5
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When I redo it, the simulation still have almost the same air velocity as before but my tuning frequency is of course way different. I can guess that you will still have to do a lot of testing when the cabinet has it's ports added ; )
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