ELECTROACOUSTICAL TRANSDUCER

An electroacoustical transducer having an annular permanent magnet with a center aperture. A pole piece is positioned in the aperture. A voice coil surrounds the pole piece. A diaphragm is operatively connected to the pole piece. A front flux plate with a center aperture is aligned with the aperture of the magnet. A back flux plate is attached to the pole piece. The improvement in the transducer comprises at least one of the flux plates having opposite parallel faces, one of which is completely flush with the annular magnet and said one flux plate having at least five sides substantially perpendicular to and between the faces, each side having an inner edge abutting the annular magnet, an outer edge substantially parallel to the inner edge, and two edges in common with adjacent sides. The inner face edges of the one flux plate is contained within the area bounded by the outer diameter of the annular magnet.