Loudspeakers

A mid/high frequency loudspeaker comprising a stiff lightweight resonant panel-form member having a core defining portion sandwiched between skin layer defining portions and a bending stiffness in the range of from about 0.15 Nm to about 24 Nm, a housing in which the panel-form member is mounted, a suspension connected between the edges of the panel-form member and the housing and by means of which the panel edges are restrained against movement, the arrangement being such that the housing and the panel-form member together define a substantially closed cavity, and an electrodynamic exciter for applying bending wave energy to the panel-form member to cause it to resonate to produce an acoustic output, the exciter comprising a magnet assembly rigidly fixed to the housing and defining an annular gap, and a voice coil and coil former assembly disposed in the annular gap and rigidly fixed to the panel-form member near to the geometric centre thereof, wherein only said panel suspension centres the voice coil and coil former assembly in the annular gap.