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Centuries before the first speakers and subwoofers, ancient Americans—intentionally or not—may have been turning buildings into giant sound amplifiers and distorters to enthrall or disorient audiences, archaeologists say.
Temples at the ancient Maya city of Palenque (map) in central Mexico, for example, might have formed a kind of "unplugged" public-address system, projecting sound across great distances, according to a team led by archaeologist Francisca Zalaquett of the Universidad Nacional Autónoma de México.
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