RandyAudio is incorrect in two respects:
Using your car battery to check for continuity will impose on the entire speaker to an unnecessary
degree... great way to open circuit or warp the voice coil if applied for more than a microsecond.
He also proclaims that a 9v battery (household type he seems to be implying) is potentially incapable
of this task. In actuality even a tiny 3v watch battery is effective and far safer- if an ohm meter is
not at hand.