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1. A speaker, comprising:
a main unit outputting sound in a first direction; a sub unit stacked on the main unit and outputting sound in a second direction, a bottom surface of the sub unit configured to be in contact with an upper surface of the main unit; a hinge connecting a bottom edge of a side surface of the sub unit to an upper edge of a side surface of the main unit, the hinge configured to enable the sub unit to tilt with respect to a horizontal axis passing through the hinge, such that the bottom surface of the sub unit is separated from the upper surface of the main unit; and a reflection plate over the sub unit, to reflect the sound output from the sub unit to a direction different from the second direction, wherein the sub unit is configured to tilt in a range between a vertical position and a horizontal position, and wherein a level of sound from the main unit is set to be different from a level of sound from the sub unit.
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