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Unique is the word which best describes Manger Speaker systems employing as they do the multi-layer full range  disc diaphragm developed by Joseph Manger  which by design is flexible enough to bend under the force of the voice coil. In the Manger driver as the disc is driven by the voice coil, its radiating area decreases with increasing frequency so, no need for more than one driver to reproduce frequencies from 80hz up.