I don't know if anyone else is running into this, but any time I'm watching YouTube videos or even playing music through the speakers, I feel as though the sound could be much higher. I've tried resetting the PRAM to see if that helps. It doesn't. It may have been my hearing, but when I plugged in my charger then I did notice an increase in volume. I'm wondering if one of my speakers is damaged. I tested the sound with multiple videos, at least four hours worth. I'm running out of ideas and sound is important to me.