IBlackKiteI said:
Aren't suppressors mean't to make more of a 'cough' sound?
More like violently sneezing into an empty bean can. That would be for something like a silenced 9mm or .45 pistol.
But it is all relative, it is still very loud but so much quieter than normal gunshot that could be heard for miles. They key advantage is silencers make gunshots sound much less distinct, especially over distance it's not so alarming; sounding like a door slamming, some gasket releasing pressure or one of the more innocuous noises.
However you can go over the top:
This is the De Lisle Carbine, contemporary of World War 2 it has a gigantic suppressor for a relatively small pistol round. Now this weapon really really surprisingly quiet, and the big slow bullet was so quiet as well being so slow. This weapon was designed to be shot within 50 feet of a sentry without them noticing (even if missed) and it worked!
All suppressors are not created equal, take the suppressors you often see mounted on M16 series in images of the War on Terror:
This weapon will still be loud as hell, that suppressor is not mounted for stealth to the extent of perfectly concealing presence but for several factors:
-reduces noise to levels closer to a sub-machine gun, the soldier can have open ears to hear enemy, also not be so deafened by his own weapon. M4 carbine has particularly loud muzzle blast due to such a short barrel and high pressure load.
-night operations and use of light-intensification optics make muzzle-flash particularly sensitive, a normal "bird-cage" flash hider is not enough. Both dazzling your comrades and alerting your enemy. On a pitch black night one guy with a mortar can home in on a muzzle flash from over a mile away, not good.
There are so many factors, you can't really say "a suppressor will always do this certain thing".