The addition of a pair of compliance elements to the “Tonpilz” configuration may be viewed as a means of matching the impedance of an electrostrictive ceramic stack to that of the surrounding medium. The application of Thevenin's theorem allows a simple analysis of the electrical equivalent circuit of this vibrating system. It is shown that this technique can be used either to reduce the size of a low-frequency transducer or to simultaneously reduce the Q and increase the power output of a mechanically limited, energy converter. Applying the latter design approach to the source described in another paper [A. H. Lubell, Paper R4, this meeting], the combination mass loads and radiating plates are trimmed in mass to the smallest value compatible with control of flexural modes of vibration. Compliance elements are then inserted between the ends of the stack and the radiating plates to bring the fundamental resonant frequency back to its original value. Because of the lower mechanical Q, higher electrical drive may be applied without exceeding the strain limitation of the ceramic stack, providing that low-loss, high-coupling, electrostrictive ceramics are employed. [This work was undertaken as part of the Hughes company-sponsored acoustic-radiation-research program.]