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par contre je me pose une question. concernant ma crainte de 50Hz. dans le manuel du filtre ils parlent de mettre un condo pour protéger la compression. ca risque de détériorer les perf du système non?
parce que vous aimez ca des photo de l'interieur de la compression, on y vois de belle piece de phase concentrique qui ne sont pas sans rappeler celle d'une 802
Jonas designed a radical silicone suspension for the 44mm aluminium diaphragm, which avoided the pitfalls of typical roll, tangential and diamond pattern surrounds, and provided excellent mechanical damping. Conventional all-aluminium diaphragms have a serious problem with tearing the suspension if they recieve signals below their normal crossover frequency. Jonas's supension eliminated this common failure mode, so Emilar drivers not only sounded good, but kept sounding good for longer than other drivers. A later refinement of this suspension technique substiuted a low-mass PET ring for the original silicone component.
et pour les deux questions:
The basic dimensions and geometry of the diaphram, phase plug, and throat are the same as in the annular phase plug style altecs. My EK's don't have the original phrams, but i'm quite sure they use a phram with a mylar surround similar to the less desireable "symbiotik" Altec phrams.
Jonas Renkus was the founder and cheif engineer at Emilar, i believe he was at some point in history a part of the Altec design team. He held several patents which coincidentally are the major differences between the Altec 1 inch compression drivers, and the 1 inch compression drivers made by both Emilar and later Renkus Heinz.
Renkus designed the diaphram in his drivers to be field replaceable. The centering method he patented for Emilar consists of a very shallow counterbore in the face plate of the magnet into which fits the precision machined and centered diaphram mounting hub, no centering pins. The diaphram is then "clamped" into place providing uniform pressure oround the entire diameter of the mounting hub rather than at three single points like the competition.