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RE: "You have touched on a rarely mentioned phenomena in "hifi" ...

All of those are known effects but consider this situation.

Out doors, at a large distance it is still easy to face into the source of sound so that what reaches your right and left ears is essentially identical and the only clues you have to distance are the ones you mention. A recording of that is the illusion we wish to produce.

So now you have two different loudspeakers that have the same spectral response but entirely different radiation patterns, one a single simple point over a wide band and the other multiple sources that interfere.

You play the recording of a distant voice with the spatial things that make it sound distant.
With your eyes closed, one speaker it is easy to tell where it is right to left and easy to guess it's say 10 feet away.
The other speaker it is also easy to tell where it is right to left but now it is not as clear where the speaker actually is in depth.

The speaker that is easier to localize is radiating a more complicated pattern with differences between your right and left ear that allow you to triangulate it' depth.
In stereo, the speaker harder to localize singly (all other things being equal) produces a stronger phantom / less loudspeaker awareness.



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