Abstract
A large-area, lightweight piston radiator is coupled pneumatically to a much smaller cone-type bass driver by means of a small volume of air trapped between radiator and driver. The piston radiator and the driver are not physically connected to one another. The piston radiator is so suspended that the resonance frequency of piston mass with suspension stiffness is below audibility. The radiator itself is designed and treated so that its own first self-resonance mode is above the bass-reproduction range in which it is employed. The basic design provides a considerable increase in radiation resistance per unit area, which results in improved bass reproduction. Theory and system equivalence to an ideal horn are discussed. Practical realizations and results are presented.
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