You can look at the front of the speaker too, all you want is to see if it is moving out away from the magnet. With your speaker cables have the one with the stripe on it connected to the negative terminal on the speaker and the other end on the negative of a battery. The other wire obviously on the positive sides. When you connect both to the battery the speaker should move out/forward.

It's more or less a way to check once you've run the wires through the car and are about to solder the join to the headunit. Have a friend watching the speaker for you if you can.

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No more GC8, sad face.
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