Showcase infantry: there seems to be no significant difference in the way the mortar explosions sound, whether I am close to them or not. And the explosions sound like they were played using an amplifier preset like theater, church etc. there is a certain reverb to it. Also, explosions usually make two sounds – first a deep impact sound like a shockwave and then the loud explosion sound (in Arma 3 I can only here the loud explosion).
- Legacy ID
Given the recent overhaul on sound, and new sound effects, I would say be patient, they probably still working on the new sound effect for explosions. Since witnessing the new sounds from latest update, I am very sure the other outdated sounds are just placeholders. So be patient =)