Abstract: A Loudspeaker Baffle Board Extender that functionally improves the sound quality of cabinet-type loudspeaker systems. The Extenders are located one to each side of a loudspeaker cabinet and may be built into the cabinet for pull-out/push-in, hinged for folding open or closed or an L-shaped structurally stiff material attached to the loudspeaker cabinet in a manner that enables easy installation and removal or opening or closing.