Examples are disclosed for a waveguide for a loudspeaker, the waveguide including a first and second outer shell coupled to one another, and a first and second inner shell coupled to one another and positioned within an air gap between the first and second outer shells, a plurality of sound paths being formed between an exterior surface of the first inner shell and an interior surface of the first outer shell and between an exterior surface of the second inner shell and an interior surface of the second outer shell, each of the plurality of sound paths having an equal path length in a plurality of planes.