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Sonic Utopia: Can we build a better sounding world?

Twenty Thousand Hertz

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How to Reduce Road Noise

Maglev trains aren't just quieter than normal ones, they are also smoother and faster. The highest speed recorded on a maglev train was 300 d, 73 miles an hour. As electric vehicles become more common, areas with low speed traffic will quiet down quite a bit.

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