Linearteam - Port End Correction Help (walls as part of port)

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Jun 18, 2013, 11:01pm

Linearteam :: Product support :: WinISD :: Port End Correction Help (walls as part of port)

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Topic: Port End Correction Help (walls as part of port) (Read 5,982 times)

tarnationsauce
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Port End Correction Help (walls as part of port)
« Thread Started on Jul 21, 2005, 4:56pm »

Hi guys.
Ok I am making a subwoofer that will be using the bottom and side walls as part of the port (rectangular slot vent). I am wondering what kind of end correction that would be?

For example, kind of like this:
[image]

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SPAN SPAN
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Re: Port End Correction Help (walls as part of por
« Reply #1 on Jul 22, 2005, 2:01am »

The EC is built into WinISD's calcs, so it's taken care of and you don't need to do any extra calcs for it.

SPAN

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tarnationsauce
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Re: Port End Correction Help (walls as part of por
« Reply #2 on Jul 22, 2005, 3:26am »

Quote:

The EC is built into WinISD's calcs, so it's taken care of and you don't need to do any extra calcs for it.

SPAN

Thanks.
I know that the EC is part of WINISD's calcualations. But I am wondering what value to use (numerical, open, flanged, etc...).
[image]

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tarnationsauce
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Re: Port End Correction Help (walls as part of por
« Reply #3 on Jul 22, 2005, 3:57pm »

The good guys at diyaudio.com pointed me to this link:
http://www.jlaudio.com/tutorials/ports/index.html

Quote:

The effective length of the port is found by adding an end correction factor. An end correction factor is necesary because more often than not, one wall of the port is also one wall of the enclosure and this wall extends beyond the end of the port thus effectively adding length to the port (remember, the driver can't "see" the length of the port, it can only go by what it "feels" is going on).
[image]

Calculating end factor may sound like it would be more trouble than it's worth, but it's actually quite simple. To calculate end correction factor, simply add one-half of h to the physical length you calculated above (L1 + L2).

Since pictures are worth a thousand words, we've included a diagram above to help illustrate the point. Click on the image to see it at full size.

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SPAN SPAN
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Re: Port End Correction Help (walls as part of por
« Reply #4 on Jul 23, 2005, 5:10am »

Glad you managed to sort it !

All the best with your project,

SPAN

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