Abstract: There is provided a loudspeaker apparatus having: a first unit arranged to propagate sound in a first frequency range; and a second unit arranged to propagate sound in a second frequency range that is higher than the first frequency range. The first unit includes a sound-radiating member and the second unit is mounted to the sound-radiating member of the first unit. The first unit and the second unit are driven by separate audio channels and/or the sound-radiating member of the first unit is planar.