A multichannel, surface parallel, zonal transducer system includes a membrane and a compound transducer mounted on the membrane, the compound transducer including a plurality of transducer elements extending generally parallel to the membrane, interconnected in a closed network and individually addressable. The method calculates a scaling factor for a first set of discrete data values compared to said second set of discrete data values. The elastic stop member has an upper end integrally joined to an upper portion of one sidewall constituting the insertion concave portion, and projects diagonally downward toward a bottom of the insertion concave portion.