Thanks to j-malotky for this Excel document.
If
you have Microsoft Excel, click on the picture below and when/if a window
pops up asking whether to save or open, select open.
Enter
your room dimensions into cells C4,5 and 6. Then enter your seating position
in the room into cells C12, 13 and 14. Then look to the right where it
calculates the single, double and triple nulls. Those are frequencies
that cancel each other out based on the mathematics of your room dimensions.
The fewer the nulls the better.
The
fewer the null and fewer the peaks the flatter the room response. That
is what you try to achieve.
The
rest of the document supports and graphs the math used.
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