00:00Roman engineers buried hollow bronze pots directly beneath amphitheaters to amplify sound.
00:06Workers tuned these bronze vessels to exact musical pitches to catch and throw human voices.
00:13Architect Vitruvius wrote that these acoustic jars turned ordinary speech into thunderous acoustic waves.
00:20Vitruvius documented how tuned bronze vessels were placed in theaters to amplify acoustic resonance,
00:26though their use on parade grounds remains unproven.
00:30This acoustic engineering resonated sound waves across the arena,
00:35amplifying the ambient noise of marching forces.
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