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If sound S played in point A reaches point B with volume V, after turning it off in point A and turning the same sound S in point B on, does it reach point A with the same volume V regardless of what obstacles are between? Ignore the noises.

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Yes. This is all to do with wave interaction. Wave sources and sinks operate independently of each other, even when waves interact with each other and with the medium through which they travel.

This is more a physics question, however it is highly appropriate to sound.

A very good explanation can be found at:

http://physics.bu.edu/~duffy/py105/WaveInterference.html

Additional information on "acoustic diodes" can be found here:

https://publishing.aip.org/publishing/journal-highlights/designing-acoustic-diode

Acoustic Diodes are objects that asynchronously affect sound depending on the direction of incidence.

  • Thanks Mark but my question is not about interaction between waves, consider that some sound S is played at point A, and it's heard with volume V in point B. Then we completely turn it off in A and play it in B, will it be heard with same volume V in A? I mean does obstacles work the same way in both directions or there may be obstacles that damp sounds from A more/less than sounds from B. Does direction matter or not? – Sassan Jan 6 at 23:11
  • Your question is entitled "is sound bidirectional?", but it sounds like you are asking if "objects" are bi-directional. Maybe I need to ask you to clarify the question a little more. – Mark Jan 6 at 23:54
  • You're right, I edited it – Sassan Jan 7 at 6:45
  • I updated my answer – Mark Jan 7 at 8:46

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