sets of split magnets which are designed to provide a shaped magnetic field that helps center the ribbon in a direction perpendicular to its length additional electromagnetic centering is provided by flat ribbon conductors located on the surfaces of the magnets sets which return the current carried by the ribbon the mid range transducer is similar to the tweeter transducer in construction except that the edges of the mid range ribbon are mechanically attached to the frame by foam strips in addition the mid range ribbon is transversely corrugated at variable slant angles relative to ribbon longitudinal axis the woofer transducer consists of an elongated trapezoidal corrugated aluminum ribbon attached to a non vibrating frame in order to provide a single electrical path the ribbon is divided into a serpentine path by a series of cuts to prevent undesirable auto effects the ribbon is tensioned in a transverse direction application_number US 46850983 A description a perspective view of an illustrative three element transducer suitable for use in the inventive ribbon speaker system is shown in fig1 transducer 100 has a generally planar shape and is mounted upright on flat base member 101 transducer 100 is only a single transducer for a conventional.