Adding my experience to this thread.

I've been having audio issues that seem to be related to Dx11, every time I boot up the game with my headset plugged in the game crashes on start up and when it doesn't and I manage to get into the title screen the audio is distorted/choppy, and I mean all audio from bgm to effects.
I'm very puzzled as when I was playing Endwalker last weekend I didn't encounter any audio problems. It just started happening this last monday.

I've noted that this happens when I have my headset plugged in, when I dont have a headset plugged into the pc the game boots up just fine. Even if I start the game without the headset plugged into the usb port and get in game, as soon as I plug the headset back in, the game just crashes.

I've tried Reinstalling my gpu and audio drivers along with FFXIV, meddled with the audio settings in windows, deactivated any audio enhancements, deactivated support for dx11 in ffxiv's client and although audio sounds alright in dx9 it lags and crashes in areas with a lot of players. I tried to play other games aside from ffxiv and they all work fine. It seems to be a specific issue with FFXIV.

At this point I'm not sure what can be done to fix this issue, and its unfortunately very frustrating having to deal with this in one of my favorite games.