There seems to be problem with the Class DistanceLowPassFilter in class CfgSoundGlobals. Apparently this filter its not applied on the explosions, no matter what explosions, non of them seems have the filter on them.

That causes the weird situation that I can hear the explosions crystal clear on any distance. From 500 to even 2000 meters and more they are fully clear, just quiet but not muffled. There was a filter before causing them to be some kind of low thud in the distance in earlier versions. But that seems not to work anymore.