Esotar E650 - Dynaudio 6.5" Audiophile Midrange Speaker Diaphragm and dust cap moulded as one piece Large 75 mm voice coil ensures high power handling Internal double magnet system with vented pole piece Internal double magnetsystem with neodymium magnet and vented pole piece Aluminium voice coil wire provides for a low moving mass, wound on kapton former in a car