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I think it could work if the intensity of the sound in the wall was so great as to cause substantial changes in the speed of sound in the vicinity. Probably this would not actually block the sound coming in from the outside, but could disrupt it significantly; but at those levels of sound, you could have lots of other effects (not all of them being particularly healthy to be around - the fact that your ears do not hear the sound does not mean it cannot have an effect on you). You would also be setting up complex interference patterns from the sound from the speakers in the square, so you will have lots of nulls and highs is various parts of the square.
What effect would this have then? Would our ears be painful?? Would it pop?? Or would we become deaf at an earlier stage..