Hi, I bought a new MacBook Air few weeks ago running 10.11.4. I somehow feel that the quality of sound is not good enough. There is no problem with the volume but if I play an mp3 file in iTunes or VLC, it sounds too "noisy". The sounds of music instruments are too amplified. If I activate the equalizer and set it to "Pop", then the sound quality becomes much much better. Is this normal or did I get unlucky with faulty hardware? I don't have another MacBook Air to compare it with. Thanks.