This loudspeaker was designed for a yacht, almost 100 in total. It is 9 inches square, only 2 inches deep and features 2 of our shallow 3.5 inch woofers and a quad tweeter array. Mounting was via through holes. No grille was specified so we assume some ceiling/walling covering will be used. The sound was impressive for such a small enclosure, usable down to 80 Hz and definitely will work as a full range speaker.