How sound carries is somewhat complex based on a lot of issues - direction that speakers are oriented, acoustic barriers that exist between the source and the receiver, wind, and distance to name a few. One of the acoustic engineers where I used to work said that distance was a significant factor in perceived loudness. Hence in an unobstructed environment a house that is 300 feet from a sound will have dramatically different perception of loudness than one which is 500 feet away. Throw in all of the other variables and it becomes impossible to determine how loud it is at one location by asking a person who is at another vantage point.
That being said, perhaps it may be useful for Havana to bring in an acoustic engineer. Perhaps things can be done in terms of speaker orientation and acoustic absorption material to mitigate the problem.
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