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If you want to compute the waterfall diagram of your box or loudspeaker, you first need to have computed the impulse response. Go to the 'Analyze' menu and select 'Waterfall'. On the GUI, select the input file and channel, then type the start time of the impulse in the audio file. Set the impulse length, be careful to stop before the first reflection to get rid of its influence. Set the 'number of analyse point' that is to say the total number of lines in the time domain. Finally, type the name of the output file. The file is stored in a binary format.
Try to design your own "Do It Yourself" loudspeakers