I would please request that the DayZ dev team implement a feature in the options menu to select the default sound device, As this feature was not found in ARMA 2 nor Arma 3, I find this to be a important and necessary feature already found in most PC games,
As a scenario, say you are busy playing and for some reason your headphones malfunction, get pulled out, pet knocks, you decide to switch to speakers, These or any situation where the headphones/speakers are disconnected in game, sound is now non existent even if you attempt to replug the previous device in. This forces a user to close DayZ and reopen the game, frustrating and time consuming.