Hi all, I've had a motherboard replacement about a year ago just before my warranty expired. After some time I realized that my sound becomes quite unclear at high volumes. Let's say I'm listening to a song or watching a movie. At low volumes, it sounds clear and crisp and I can hear the audio clearly. However if I crank up the volume, the sound becomes quite unclear and muddy. However when I use earphones it's fine. I remember I used to be able to play movies and songs at maximum volume in the past before the motherboard replacement and I did not have this issue. Does anyone know what could be the cause of this and what could be done? Is there any chance Apple would fix it because my warranty has expired?