A mounting ring with which an engaging hook of a fall-preventing member is to be engaged and a flexible handle member are fixed within an area of a cabinet section that is located upward of a first plane passing through the position of a center of gravity of the cabinet section generally in parallel to the bottom surface of the cabinet section and located to one side of a second plane passing through the position of the center of gravity in intersecting relation to the first plane. The speaker unit hung by the handle member being held with a hand of a human operator is inclined, so that the mounting ring is oriented upward near the hand. Thus, the human operator can perform with ease an operation for engaging the engaging hook with the mounting ring with one hand while holding the handle member with the other hand.