I thought the loudest sound possible in our atmosphere is around 190db? I may be wrong but I always heard that once you reach that point the air in our atmosphere can't be compressed any more. I'm sure at a higher altitude more db's would be possible since the air is thinner but nowhere near 1000db's.

I;ve read thats the case for speakers ,at 194db the speaker would begin moving in its own created vacuum ,so at that point wont be able to reproduce sound .

Nature has phenomenons man can never immitate with technology though

On that note (194 dB) human eardrums rupture At 200+ the shock wave (it's no longer a sound wave) literally kills people.