three points form a triangle. May, or may not, be a "right triangle" (there may, or may not, be a "right angle" involved. doesn't matter if there is, or if there isn't).
two points are where the point sources are. third point is the listener.
draw three straight lines to connect the dots. the three lengths of these lines are defined above : D, D1, D2
The distance D does NOT matter ... so, for two point sources, throw away all the "ctc" rules everybody quotes but nobody understands. The distance D1 does not matter. The distance D2 does not matter.
What DOES matter is this : D1 - D2 = DD
When you know DD ... and ONLY when you know DD ... you will know what the comb filter frequency response is.
The SMALLER we make DD, the HIGHER in frequency the first comb null will be. This is a GOOD thing.
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