This paper considers how the details of internally mounted mechanical oscillators are related to the acoustic scattering features observed in the measurements of Bucaro et al. (1997) and Photiadis et al. (1997). These measurements — the monostatic scattering as a function of frequency and angle from a submerged shell with many internal oscillators — have been interpreted (Bucaro et al., 1997) in the context of local admittance fluctuations caused by the presence of the oscillators. The theoretical basis for this effect is reviewed and specific details in the scattering spectrum are connected with certain shell/ oscillator parameters.

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