Thank you for the reply BlazeShark.

You mentioned you reinstalled your drivers, which ones did you reinstall? You may also have some other sound drivers on your PC (such as Nvidia Audio drivers or Realtek Audio). Did you update or reinstall these as well?

To clarify, this only happen when the head phones are plugged in and the sound comes through the speakers and not the headphones, correct?

I'd also suggest trying a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. This will make sure that no background processes are interfering with the game.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!