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View Full Version : how do you go about to figure out port velocity?



splescort
11-20-2011, 10:19 PM
how do you go about to figure out port velocity?

Moble Enclosurs
11-21-2011, 03:55 AM
In all honesty: v=w*x*a1/a2*(w^2/wport^2-1). Then mach=v/c, where c=wavelength*frequency or 344.41m/s. To be honest, it gets much more complicated. :) where w=p/4/Pi/rad^2 and wport=sqrt(kport/m2 where kport=(1.4*a2^2*patm)/vbox where patm=101.3e3*Pa(pascals). Etc,etc,etc. Not something to explain in a text or two.

brodeisel
11-21-2011, 03:56 AM
You know i would be able to under stand this if you told me what each varible ment.

Moble Enclosurs
11-21-2011, 04:00 AM
That is the key right there. :) it can be simplified once it is understood. Any formula can be taught, just takes time and effort and more importantly, understanding. And that usually comes at a cost now days, lol.

brodeisel
11-21-2011, 04:02 AM
yeah it does. Shoot i think i could figure out some of the variables but not all of them.

brodeisel
11-21-2011, 04:21 AM
but math can be so much fun

Moble Enclosurs
11-21-2011, 04:51 AM
WTF is port velocity?

You nerds need to put down the pocket protectors and slide rules and put some sawdust on the floor.

Haha nice. :)

Moble Enclosurs
11-21-2011, 05:09 AM
WTF is port velocity?

You nerds need to put down the pocket protectors and slide rules and put some sawdust on the floor.

I can't send you a PM now...says its full. :( my email is mobileenclosures@gmail if you wanna talk about what we were talking about.
As to the OP, I wish I could be more help to you right now, but the best I can tell you, is if you figure for it, the m/s limit is about 25-30 at lowest impedance of the design. That's all I can say about it as it is very complex to understand fully.

kushy_dreams
11-21-2011, 12:08 PM
Easiest way- download win isd, play around with different boxes and woofers, on the vents tab it will display port mach aka port velocity.

sacsking916
11-22-2011, 03:13 PM
I can't send you a PM now...says its full. :( my email is mobileenclosures@gmail if you wanna talk about what we were talking about.
As to the OP, I wish I could be more help to you right now, but the best I can tell you, is if you figure for it, the m/s limit is about 25-30 at lowest impedance of the design. That's all I can say about it as it is very complex to understand fully.

im going to be sending you an email just to get a little more knowledge about it if thats ok with you?