No offense to you "experts" giving input on the sound changes in the last two updates (1.12 & 1.13). I'm here to tell you that 3.5km (2 miles) you aren't hearing even a .50 Cal machine gun or hand grenade. Even at 1800 meters (on open terrain) a MK19 Fully Automated grenade launcher sounds lower than a firecracker. I'm giving you this input from first hand experience multiple times in actual practice. So all your negative input about wanting to hear a gun shot across two miles of mountains, trees, and cities is the most unrealistic thing anyone who's ever actually shot weapons extensively could imagine. Trees deaden and absorb sound by changing and filtering it's direction. Cities absorb and deaden sound by trapping it and bouncing it off the walls until the sound waves die out. Mountains absorb and deflect sound even.
The only way you're hearing a large caliber shot at a mile or more is if it's nothing but flat, open, sparse landscape.