Loudspeaker design using Open Office Calc (or Excel)

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To report some progress: I have used Octave to interpolate and resample the data for 2000 data points from 10 Hz to 100 kHz and I can finally add them together in a spreadsheet:D

Some very useful links:
http://homepages.nyu.edu/~kpl2/dsts6/octaveTutorial.html
http://www.gnu.org/software/octave/doc/interpreter/Simple-File-I_002fO.html#Simple-File-I_002fO
http://www.gnu.org/software/octave/doc/interpreter/One_002ddimensional-Interpolation.html
And the "logspace" command:)

To my surprise, it does not work as I expected (something to be expected:D ) I cannot simply add two responses together, that is a nonsense - I realized that immediately after seeing the first plot. What is the correct mathematical way of doing it? I have a few ideas to try - but I would prefer the right way. Does anybody know?
 
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Joined 2008
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Of course it is just simple adding! But not in dB, that would be actually multiplying. Sadly enough, my business trip is at its end, so I will not have that much time for this stuff. It is not very user friendly approach, but it seems effective to me. Octave (instead of spreadsheet sotware) is the way to go:)
 
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