This invention is a device that is mounted on the top of a movable office partition to improve the acoustical efficacy of the partition. It is equally effective on new or on existing partitions and can be made to fit all the major brands in the movable partition market. It is attractive, lightweight, durable, inexpensive to manufacture and easy to install. The device is able to absorb incident sound and redirect diffracted sound to a path that will reduce sound levels reaching a listener in adjacent cubicles.