The C-QXC33S is a loudspeaker was designed for a yacht, almost 100 in total. It is 9 inches square and only 2 inches deep and features 2 of our shallow 3.5" 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 80Hz and definitely will work as a full range speaker.