Water Noise Sloshing

[tucpal]

yes it can it can corrode the speaker wires water will make its way past the seal and work its way into the door
the holes are there to let any water out if they are blocked like yours were then they will collect water
and it has no were to go i have seen and heard of this on many cars before
i would remove the door card and see what is blocking the holes and make sure
the bottom of the door is clear if the holes are unblocked it will not happen again.

it will just be a case of what ever was blocking the holes being removed.
it looks worse then it actually is but i recommend finding out what is in the bottom of the door
by removing the door card and having a look lucky for you you need to swap them over anyway
for the leather ones