I don't know of any other way to describe this and I don't know if it's normal. I just now realized, after having my NBC for almost 10 months now, that there is sort of low white noise even when I turn the volume all the way down to minimum (after it beeps). Is this normal? The noise is not audible when music is playing. If you turn it down to minimum, it's audible, but really faint. I'm just making sure that my speakers aren't damaged or anything... I didn't think I played my music loud at all.

It's not a crackling sound or anything, just a faint white noise-ish type of a sound.