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It doesn't work that way. In order to increase the loudness all cats would have to meow the exact same way. Same with humans. My psychology class went to a museum about senses and there was this small glass chamber where one could go in and shout as loud as possible. I went in alone and shouted "F*****CK". After me 5 others got in and screamed as loud as they could. The actual loudness was the same. Think of it like throwing stones in a lake. If you throw 1000 stones in they would not create a giant wave but many small ones. Some would amplify each other, some would cancel each other out. So 2bn cats would be 65/75 dB loud but at 2 billion different frequencies, driving every person with (for example) Asperger autism completely made but not creating a sound loud enough to put (presumably) the FRIGGING ZAR BOMB (the biggest ever detonated nuclear bomb) at shame