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You can also install the rigid foam insulation they sell at any Building Supply store. Regular fiberglass insulation won't do much at all but the rigid stuff will. An additional layer (if there is one already) of drywall to the inside of the closet will deaden the sound.
Make sure to add the insulation to the back of the door you install as well since the door will transmit sound.
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Strive to be more curious than ignorant.
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