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Headphones and Vacuum Tubes

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antenna:
It is a lot more complicated when you start adding in varying signal amplitudes and frequencies, with differing frequencies at differing phase relations.

But that is why it sounds "spacious."  The human hearing uses phase differentials in the sounds the ears receive to help determine the location of the source of the sounds.  Those phase differentials are why instruments sometimes sound like they are coming from an area outside of the two stereo speakers.  Your ears have been tricked by an audio engineer.

I haven't played with this in decades and, to be honest, nowadays my brain hurts when I try to visualize it.  :D

 

AGAWA:
"goniometer" - used in recording studios

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