The midrange driver should precisely reproduce every musical nuance while introducing not even a trace of its own colorations or distortions caused by diaphragm resonances or electromagnetic nonlinearity. The most exciting innovation in the CS3.7 is a new midrange diaphragm that advances midrange performance much closer to this ideal.

The midrange driver's diaphragm is constructed with an entirely new shape that provides far greater stiffness than typical diaphragms, even those made from exotic materials. The diaphragm is shaped with corrugations that are oriented from the center outward (like spokes) and act a little like small I-beams to provide enormous strength in that direction. The large diameter voice coil attached to the diaphragm gives it strength in the other direction--around the circle. This design achieves such great stiffness that the diaphragm continues to vibrate perfectly, as one unit, all the way up to 20 kHz, usually considered the upper limit of human hearing. Such fabulous vibrational behavior is unprecedented and allows the CS3.7 to achieve a purity and delicacy of the high frequencies that is extraordinary.

This new diaphragm geometry also has a second important benefit that derives from its shape. The diaphragm is basically flat and therefore has virtually no detrimental effect on the tweeter’s output, unlike a normal cone shaped diaphragm that alters the sound of a tweeter mounted in its center.

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