MacBook pro hissing speaker
I got a 15 in MacBook pro 2016 with touchbar. The speaker on my macbook pro is making this hissing noise everytime after the music or whatever sound stops playing. It lingers for about 20 seconds and then become quite. The sound is barely noticeable unless you put your ear against the speakers, maybe this is why I can't find this problem online anywhere. It basically sounds like the fan in the laptop is spinner faster and then slows down when the hissing stops.
I went in the apple store for an exchange, but the new one has the same sound. I just wanna know is this normal or at least very common? Or am I just too lucky to get it twice?