I'm a little disappointed. Generally Tam's blog is a bullshit-free zone. Given her interest in historical weapons, I was sure she'd have some experience with Delisle carbines.I've been on the range sans ears when a modern Delisle clone was fired, as well as something very like a Welrod. And yes, they were quiet. For guns. An unabridged Webster's being dropped on a carpeted floor is quiet, too, compared to an unsuppressed firearm, but it's not something you'd want to hear while creeping up on Dr. Evil's henchmen.
Who you gonna believe? The dB meter? Or your lyin' ears? ;)
(As the video points out there, an integrally-suppressed deuce-deuce manual repeater is very quiet. So's a spring-piston .22 air rifle. Both are a lot louder than you'd think when you cap one off in your back yard at a 'possum at 0mygawd30 in the morning. Ask me how I know.)