How is one supposed to figure out an acceptable port speed in a rectangular port? Using collo's "flare it" program, it's easy to tell what ports are going to work, but with a slot port, it's hard to tell if a port will work or not..
where you'll see....
"When calculating usable velocity, you need to make allowance for the corners being less streamlined than the rest of the flare. Modelling the flare radius as 25% smaller should do the trick"
Thanks for the reply, I just figured it out earlier and was modeling stuff when I checked here. Do port resonances matter when looking at flared ports? Should they also be below the 'accepted' 36. inches?
I must have posted my last note just as you were. You may want to check out this thread that discusses port velocity and first resonance -- I asked the same question just a few days ago.
I'm no expert on the subject, but you can manipulate slot port parameters in WinISD Pro (but not WinISD online).
1. Download WinISD Pro - Alpha release (kind of glitchy when you attempt to close).
2. Select a driver or input T/S values (Qts, Qes, Qms, Fs, Vas)
3. Select VENTED box type.
4. Select ALIGNMENT of your choice.
5. After the frequency response is plotted, go to the VENTS tab. Click on the circle below SHAPE. This will toggle the vent to a rectangular shape and allow you to input H x W to yield port length.
6. From there you get port velocity among other very useful modeling information.
Hope that helps.
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