An electroacoustic sound generator of the type having a diaphragm vibrating in the audio frequency range is described. The diaphragm is mounted in a housing which is constructed to form first and second volumes, the former being smaller than the latter. The housing has channels formed therein for communicating sonic energy to the exterior from the first interior volume portion. The first volume portion together with the channels form a Helmholtz resonator tuned to the frequency of the sonic energy to be radiated. The resonant frequency is determined by the product of the compliance of the first volume and the square of the ratio of the cross-sectional area of a channel to the surface area of the diaphragm.
