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If Gojo used Infinity to block the sound waves, he wouldn't hear it at all and there is no dampening effect you can argue for because Infinity doesn't work that way, if something is affected by Infinity then it is completely stopped from reaching Gojo. Sound waves propagate through a medium like air which Gojo allows to pass through Infinity thereby allowing sound to pass through InfinityIf Gojo didn't block the soundwave at all his eardrums would have been completely blown off. The fact that he could negate it to the point that it ended up being harmless tells us that he can block sound-based attacks.
Sorcerers can reinforce their ears with cursed energySoundwaves don't really act upon the traditional AP formula. Plenty of characters in fiction can have their eardrums blasted out from sound-based attacks despite the fact that they can blow up planets or smthn