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If it's a bedroom the cheapest way is a steel front entry door (that used for the front door of a house) installed in your bedroom with a sill. Most bedroom doors are thin and about 1/2" up from the floor and let all kinds of sound out that way. Oh yea you can always go with the wall to wall shag carpet thing on the floor/walls and ceiling with a sealed off door, Green carpet that is and call it the "Green room"
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