The stuff that's mimicked in movies would probably be something like a silenced 22 short round or maybe a subsonic 22LR round. The primary noise of a gun is the bullet breaking the sound barrier, the secondary noise is the actual powder burning. You can absorb some of that with a suppressor but if you shoot a round that goes faster than the speed of sound, you'll still get an audible and identifiable 'crack'
A hand gun round will usually run you about 145-160db. There's a lot of variation here like barrel length, load, all of which influence speed which is also a factor. Take 30db off that with a suppressor and you're still looking at over 100db and maybe even over 120db which is the hearing loss range.
At best, a suppressor brings the sound from 'hearing loss' to 'quite loud' for normal rounds.
For a subsonic 22 round you're looking at something like 60-70db, take 20-30db off that and you get that sound that you hear in movies.
A hand gun round will usually run you about 145-160db. There's a lot of variation here like barrel length, load, all of which influence speed which is also a factor. Take 30db off that with a suppressor and you're still looking at over 100db and maybe even over 120db which is the hearing loss range.
At best, a suppressor brings the sound from 'hearing loss' to 'quite loud' for normal rounds.
For a subsonic 22 round you're looking at something like 60-70db, take 20-30db off that and you get that sound that you hear in movies.