The streets are a constant roar of from the motorbikes and other traffic. There is a primitive form of advertisement that occurs in this constant roar. In Nha Trang I heard a car coming from many blocks away. By the time it was two blocks away it was already deafening, clearly above the 90 db required to cause hearing damage. I retreated into the store and covered my ears as it continued to approach. The car was mounted with two huge 5’ bullhorns that it was using to spew out the deafening message. After it passed by the second time I realized why I had not seen anything like it in the US. It is highly ineffective advertisement and they would have been fined for disturbing the peace or something.
In the places speakers are installed such as theme parks they like to use one large speaker and blast the noise instead of separating the delivering into multiple locations of smaller volume.
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