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Just pick a reasonably flat panel, drill a few holes, fasten a few screws, and you’re listening to stereo. INSTALLING OVAL SPEAKERS IN REAR DECKS OR FLAT SURFACES Most cars are factory-equipped with speaker openings in the rear deck (package shelf). By examining the underside of this panel, using trunk access, you will probably find at least one (usually two) oval-shaped holes in the steel underliner of the rear deck. The size of these holes vary with the make of car, but the most common opening