I don't know why you find insufficient my first post, so i will try again, again and again if needed.

https://forum.square-enix.com/ffxiv/...-ambient-sound

Since patch 6.08 ambient sound volume is changed (made more loud).
I not so sure about other sound effects, but they also seems to have different volume now. Which is not good, but it's not worst part.

And there is absolutely obvious issue with underwater ambient, which i clearly show in this video: https://www.youtube.com/watch?v=lm_t3qpGRUM

If you can't watch video , steps are:
1) dive underwater (Ruby Sea as example);
2) mute BGM;
3) put slider of ambient to 15 or 10 to hear issue clearly (but it also can be heard even at 60).

Date & Time: Since patch 6.08
Frequency: Constant
World name: Any
Character name: Any
Class/Level: Any
Party or solo: Any
In-game time: Any
Area and coordinates: Any and especially broken underwater
Housing: Yes, too. There are now very loud birds, crickets and waves inside house.

PC Specs
Same as before 6.08