My gf has had this issue for past 2 days and we fixed it today, here is what we did. Turn off spatial audio such as dolby atmos and windows enhancements such as bass boost. Launch a separate game before launching FF14 (in our case it was outriders on steam), launch ff14 client and turn off DX11 before logging. Static was gone and she can now hear all sounds instead of just BGM and crackly SFX.

Imo the embody sound pack screwed up the already shoddy sound code that FF14 has, before this bug her sound would go out on 14 when changing literally anything audio related. As a sidenote the embody addon is a gimmick, it does not enhance spatial audio at all, I am glad I got the free trial and found this out before hand. Going to test her sound with dolby atmos enabled but I have a feeling turning of DX11 should help in most cases and allow us to turn all enhancements back on.