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"Just a note to tell you how happy I am with the work that you did in transferring my old acetate ABC Radio program recording to CD. Although it was still playable the chemicals in the acetate were deteriorating and it would be just a matter of time before the surface would begin peeling away from the metal base. The transfer you made is ..."

Acoustic reflectivity

The ratio of the rate of flow of sound energy reflected from the surface on the side of incidence to the incident rate of flow.