The Magneplanar MG-1.7 is NOT a true ribbon speaker. It is a quasi-ribbon speaker. This means the wires on the Mylar are flat not round. It is still a planar magnetic speaker as the woofers are for all Magnepans. The move to flat wires over the round wires probably improves control of the Mylar by the amp/magnets.
The true ribbon drivers in Magneplanars are aluminum foil held in a metal frame with magnets on the sides. The aluminum does the 'talking'.
That linked review/description has spread some errors through the boards.
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