Перевод шага 3
Twist the side subwoofer grill counter-clockwise to release it from the case.
You can then remove the grill by tugging a bit on it. There is adhesive keeping it stuck to the main body, so pull slowly.
You now have access to the side-firing subwoofer (and the passive driver on the other side). You can remove the four Phillips screws and replace these speakers, if you're stopping here.