Loudest Sound Ever?

For me the loudest sound I can recall, would be from a RAF Vulcan bomber displays at the Abbotsford Airshow back in the 1970's. Those Rolls Royce Olympus engines at full thrust howled and ripped the air. It was an impressive part of the demonstration. Honourable mention would be the SR-71 demo at the 1986 Abbotsford Airshow. With both engines in  afterburner  that aircraft roared to impressive levels, very exciting.

 

Also to add, back in the day of my hi-fi retail and car audio, it was the in thing to have DB contests. Our shop ran one and  I had the setup to mic each car competing. Of course all these cars were insanely loud.

 I recall one kid (20 something) as I set up the microphone on the passenger seat and asked if he wanted to put on the industrial grade over the ear hearing protection. To which he looked at me and said NO. I thought he was nuts but so be it. I got out of the car and closed the door and off he went.

The booming bass notes from the audio he was playing was literally and visibly  shaking  the whole car, rattles and such abound. I looked inside and  figured this kid wants to be deaf before he was 25. I mean outside of the car it had to be well over 100db. I'm tying to remember  how  loud the decibel  meter was showing... I'm  sure it was like 135db. I COULDN'T  BELIEVE THIS GUY WAS INSIDE HIS CAR RUNNING THE AUDIO SYTEM!