Pretty much the same issue I reported for ArmA 2 here [ https://dev-heaven.net/issues/70640 ] as I suspect I still applies to ArmA 3.
In ArmA 2 having Direct Channel on effects it makes it that it's impossible to reduce volume of shooting and explosions to appropriate levels without making Direct Channel impossible to hear (volume too low), while "realistic" this is impractical as on real life shouting over gunfire is a viable option while shouting over gunfire wile playing a video game at night in apartment is not.
As such I'd also like this fixed in ArmA 3 if it's still the case.