Abstract: A sealing panel for automobile doors maintains weather-tight characteristics without degrading the acoustic response of a loudspeaker mounted in the panel. The panel includes a cup-shaped loudspeaker housing having a back which is provided with cells. The cells prevent reflection of sound radiated from the rear of the loudspeaker. The cells are open at one end, where they interface with the back of the loudspeaker housing, and the opposite ends of the cells have at least one opening therein. The panel is made from a sheet material such as a thermosetting plastic. The cells may be frustoconical with an average diameter between 3-20 mm and a depth of about 3-25 mm.