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  #1  
Old 08-30-2012, 03:55 PM
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Default Vent Mach and WinISD

I've been throwing some numbers around in WinISD and after awhile I realized I don't know what type of numbers I should be looking for. The main one is my Vent Mach? What is a good number, most of the numbers I seem to get are .01... I doubt that's good but I'm just curious.

If I read my WinISD correct, it should play from 29 to 58 Hz? With a 30 dB gain at 42Hz? I believe i'm lost.
and I doubt this is good lol, but please tell me what I should do if it's not good, or just some pointers

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Old 08-30-2012, 04:13 PM
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MACH is the speed of sound in moving air. The spec refers to the air "speed" or "velocity" in the vent. Welocity higher than 0.10 MACH at full power will have audible port noise no doubt about that...

Keep this in mind, MACH will vary on power and how much air your driver will displace. At tuning frequency it is the highest.

What Driver are you using and what size is the box? and port?

Last edited by DonH; 08-30-2012 at 04:15 PM.
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Old 08-30-2012, 04:17 PM
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So when you say higher do you mean like .11 , .15 , .2?
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Old 08-30-2012, 04:22 PM
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Quote:
Originally Posted by xnewbx View Post
So when you say higher do you mean like .11 , .15 , .2?
yes, .11 is a greater number than .10 lol
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Old 08-30-2012, 04:32 PM
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Ok well on a side question, what is the Pe, Le, Z, and Sd? My sheet with my T/S parameters does not have this information?
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Old 08-30-2012, 04:44 PM
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chk the link brah
http://www.the12volt.com/caraudio/thiele.asp

Z is the nominal impedance of the driver.

Last edited by DonH; 08-30-2012 at 04:47 PM.
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Old 08-30-2012, 05:07 PM
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Alright well if this 'general' design looks good from just the picture I'm going to go ahead and build it. I'm not trying to get HACK accurate, but trying to just get something that should work from the charts and knowledge alone.
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Old 08-30-2012, 05:24 PM
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Make sure when you input all the enclosure info you are inputting the power you are running...otherwise the vent mach won't show up correctly on the graph.
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Old 08-30-2012, 05:38 PM
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Do I change that in the plot bar? Because no matter what I input the mach is always the same.
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Old 08-30-2012, 05:44 PM
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Quote:
Originally Posted by xnewbx View Post
Do I change that in the plot bar? Because no matter what I input the mach is always the same.
Under the "signal" tab in the part that shows all the box/port info, there is a "system power" place to input it.
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