For reference, the loudest sound ever on earth was 180dB https://wikipedia.org/wiki/1883_eruption_of_Krakatoa
this post was submitted on 29 Aug 2025
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The decibel scale is logarithmic, meaning that a 20,000 dB sound would carry an unimaginable amount of energy.
A hypothetical 20,000 dB sound would have an overpressure of approximately 5 x 10^499 atmospheres, enough energy to obliterate the Earth instantly.
Oh yeah? Then why didn't it destroy Gotham City? Checkmate.
Same reason Batman survives injuries that would be fatal to a normal person and why the thugs he beats up never die: the DC universe is just built different.