Patent ID: 7823693

Claim:
An acoustic panel assembly comprising: a rigid panel having a front side, a rear side and an opening therein, the panel having an edge rib projecting rearwardly and surrounding the opening, and the panel having a wall spaced apart from and surrounding the edge rib; a frame having an outer border and a plurality of cross-pieces extending between different parts of the border, the frame having a compression rib projecting in a front direction and towards the panel from an inner portion of the border; and a sound control sheet mounted in the opening and having a surface exposed directly to sound, the sheet having an outer edge portion held between the edge rib, the wall, the border part of the frame and the compression rib of the frame, the compression rib projecting into a rear side of the sheet, the edge rib projecting into a front side of the sheet, the sheet forming a shoulder, and the shoulder and the edge rib forming a coach joint.