Normally when you are shooting in RL you wear some Ear-protectors.
I think it would be nice if you add some "rining in the ears" when a gun/rifle is shot without a supressor. Especially when you are shooting with a rifle inside a building or a hangar at the airfield where the pressure can't escape into the air.
The effect of this might be, that you can't here doors opening and footsteps for a few seconds because of this.
In addition there might be an additional item, like protectors, to minimize the effect mentioned above.
I'm of the opinion that it could be a nice feature, just vote to see if you also like it.