Mounting support device for ceiling embedded speaker system

An auxiliary mounting device for an in ceiling speaker system, comprising:

• a ceiling reinforcing element;
• and
• an elongate element,
• wherein the ceiling reinforcing element includes a flat plate portion provided horizontally on a rear surface of a ceiling plate and having an opening at a center portion thereof, and a vertical portion provided to extend vertically from the flat plate portion,.
• the elongate element is provided to extend on a horizontal plane,
• the vertical portion is mounted to the elongate element such that the vertical portion is capable of being in a slidable state and in a fixed state,
• in the slidable state, the vertical portion is vertically slidable and displaceable with respect to the elongate element, and
• in the fixed state, the vertical portion is fixed to the elongate element so as not to vertically displace.