An improved horn-type loudspeaker system for reproducing an acoustical signal from a corresponding electrical signal includes transducer assembly, an acoustical transformer and an output horn assembly. The transducer assembly includes an inner driver cone, an outer driver cone and a dust cap constructed such that the direct path length from the voice coil to the outer driver cone periphery is substantially equal to the distance from the voice coil to the dust cap peak. Mechanical vibrations produced by the voice coil propagate to the outer driver cone periphery and to the dust cap peak in the same amount of time; thus the acoustical signals transmitted by the outer driver cone periphery and the dust cap peak are substantially time-coherent. The acoustical signal transmitted by the transducer assembly is directed toward the horn assembly by an acoustical transformer through plurality of radial waveguides. The location and form of the waveguides efficiently transfers the acoustical signal from the transducer to the horn, without converting the source to a ring radiator, thereby preserving the source directivity. The shape and proximity of the acoustical transformer to the transducer also provides a uniform, low mechanical reactance to the transducer assembly. The acoustical transformer further includes a throat mode barrier which interferes with the formation of extraneous modes in the beginning of the horn assembly.