I'm knee deep in fingerprints, Form 4 and passport photos right now trying to buy a supressor for my Walther P22. I will argue about this quote
"An unsuppressed .22LR out of a semi-automatic pistol is about 160dBA and will cause permanent and total hearing loss at close range. A suppressed .22LR out of a semiautomatic pistol is still 127dBA, or about as loud as the front row of a rock concert(!)."
I got to test fire my supressor I'm buying when approved, and all I could hear was the action of the pistol, and a very quiet "poof" of air. I do have a sound meter, and now my interest is peaked. But currently I'm awaiting the signoff by CLEO.