Abstract: A loudspeaker enclosure comprises a rectangular box-like housing (100) consisting of top (102) and bottom walls (104), front and back walls (106), left (108) and right (110) side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure (200) located within the housing (100) and extending from the top wall (102) to the bottom wall (104), from the front wall to the back wall (106), and from the left side wall (108) to the right side wall (110), the hollow stiffening structure (200) comprising a first set of spaced-apart stiffening panels (1,2,3) arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair (102, 104) of opposed housing walls, and a second set of spaced-apart stiffening panels (4,5) arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair (108, 110) of opposed housing walls, the stiffening panels (1,2,3) of the first set being secured to stiffening