Loudest Sound Ever?

Black holes may burp, perhaps that is what was heard….

As I have gotten older, I have less tolerance for very loud music.  At a rock concert, I have been known to pack my ears with cotton so that I can enjoy the music without grimacing in pain.  At home, my listening level is low-to-medium — definitely lower than probably a lot of other members here.  Only occasionally will I listen at louder levels, and usually that is when driving in my car. 

Black holes do not burp. You are maybe thinking of Hawking radiation? 
http://scholarpedia.org/article/Hawking_radiation

        "Technically the conditions prior to the Big Bang are undefined."

                  Factually: no one knows the Big Bang happened.

                         That's why it's referred to as a, "theory".
 
              ie: Hawkings works = Theoretical Cosmology/Physics.

https://www.newscientist.com/article/2053929-a-brief-history-of-stephen-hawking-a-legacy-of-paradox/ (RIP)

I was sitting one time in the front row at a Robin Tower concert ,I could hear after the concert....When I was young we would go to a concert and then take the NYC subway home both are really loud.Another time we were having lunch at my grandmother's house it was a ranch and the house next door blew ,and man that was loud.Gas explosion...