maybe there is a dot between 63, witch would make it 6.3? i don't know.

I will say this LC speaker the sound at #7 is LOUD but not distorted, its crisp.

Maybe because of those enhanced sound holes apple drilled into the side I don't know.

Maybe they installed the wrong speaker at the APPLE Philippines Devision and that is why it blew in the first place.

as we all know mistakes do come from the factory.