MJK Worksheets

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I'm assuming the MJK ported worksheet is assuming that the port take up the volume of the dimensions (LxHxW) specified. Is this true?

For example: if I have an enclosure dimension of 12" cubed and a port with unknown dimensions, I would have 1 cu. ft. of volume minus the volume of the air contained in the port?
 
I'm assuming the MJK ported worksheet is assuming that the port take up the volume of the dimensions (LxHxW) specified. Is this true?

Wrong. The worksheet assumes the port is outside the main volume. I suppose it is obvious that the worksheet also does not take the volume of the driver into consideration either. It is best to build a little extra volume into the design than the model would suggest.
 
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