2.Screw in the six clamp screws. As the screw turns clockwise, a clamp rotates out and presses onto the back of the sheetrock to hold the subwoofer firmly in place.
Tighten the clamps so they are snug, but do not overtighten, as they could damage the sheetrock.
Final steps
1.Add the grille to cover and protect the woofers.
2.The grill can be painted if desired, and this best done when it is not attached to the subwoofer.
3.Enjoy your new subwoofer.
Tighening the clamps (sheetrock not shown, for clarity)
User's Manual 
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