The Profile tweeter replaces the TRC model of the preceding Electra line, which used a dome from the Tioxid 5 family (titanium dome covered with a 5µm film of titanium oxide). The knowledge acquired from mastering the pure Beryllium dome demonstrates that we have indeed pushed the evolution of the technology to its limits, especially in matters of damping. The alloy of aluminummagnesium is an excellent solution; with similar characteristics of rigidity and linearity, damping is far superior. The inverted dome tweeter The traditionally designed tweeter with convex membrane requires the use of a coil glued to the peripheral edge of the dome. There are no other possible choices. This, however, is far from favorable, as the mechanical coupling is less than perfect. There is a true lever effect between the center of the dome and the far removed coil. Tests and simulations show that the center of the dome is no longer reactive at high frequencies, and stays frozen. Only the peripheral edge of the dome in direct contact with the coil (the most rigid) is reactive. Dynamic behavior is compromised, which translates as a decreased output and an affected directionality. An inverted dome acts much like a woofer, in smaller dimensions. The coil rests on the inner part of the dome, distributing the impulse more uniformly over the entire surface of the dome. This improved mechanical coupling also permits a lower resonant frequency, an important consideration when determining the cutoff frequency between the tweeter and the midrange, with a minimum of distortion. Last, but not least, compared to a conventional dome of equal diameter, the inverted dome’s coil has half the mass, an enormous conservation of energy. This is an essential parameter in dynamic behavior.
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