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Omnidirectional point-source driver array calculator
This Excel spreadsheet displays polar and frequency response graphs for an array of omnidirectional point-source radiators in a specified arrangement.   It can be used to model subwoofers and can show interactions between multiple drivers, the effect of "ground bounce", directional (cardioid) behaviour, and similar phenomena.

Spreadsheet to demonstrate microphone pickup patterns
This Excel spreadsheet is intended as a teaching aid.  It displays a graph showing the polar pickup patterns of microphones of various types.  It will show the pickup pattern resulting from any combination of omnidirectional and figure-of-eight response.

Spreadsheet to demonstrate harmonics
This Excel spreadsheet is intended as a teaching aid.  It shows the waveforms created by adding various combinations of harmonics (up to the twentieth order) with various phase relationships.

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