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Listening my Macondo with new “Fundamental channel” I noted that my tweeter is not as effective as it use to be. The effect of “not-effectiveness” is very minor but at some recordings it is notable. My T350 still sorts the Vitavox S2’s top but it also begin to pick a tiny bit off fussiness. I presume that it comes from reflections. The EV T50 notoriously want to sit aside very far from everything, including any baffles. Also it wide radiation pattern does not really comply with it’s current location. I will do further experiments, trying to put my T350 horizontally and some other action that “might” be successful (as I do not know the real reasons why the fussiness came to the picture) but I also ask myself if any other tweeter might be utilized in new Macondo.

T350 is wonderfully soft but it 120x60 degree radiation is very completed in context of my current setup.  My initial idea was to use the beautiful copper tweeter from Celestion  (I LOVE that tweeter) but it needs 100+ amplification and no any amplification but very good amplification. It would be too ridicules to have 100W PP SS to drive a tweeter.

Looking (again!!!) at the army of available tweeter with narrowing deposition I discover a new opportunity. Fostex has their T-line compression tweeters, they are aluminum in alnico: T-90A, T-500A, T925A. I had them. They do well with slow and sleepy Altec’s MF (although they even with Altecs a bit too hard to me) but with Vitavox they very brutal. So, how big my surprise was when I discover that Fostex did acknowledge the problem and introduced a new version of thier T-tweeters: T90A-EX and T500AmkII. Those new drivers are the same old drives but with bigger magnets and the diaphragms made not from aluminum anymore but with magnesium.

http://www.goodsoundclub.com/pdf/Fostex_magnesium_foil.pdf

Wow, this "might" be very interesting and practically in context of the Fostex public revelation: “ Pure magnesium diaphragm having superior internal loss, having less unpleasant overtones as heard in other types of metal domes.” Those “unpleasant overtones” was exactly what bothered me in the old Foxtex tweeters, but again, that revelation very much might be a marketing BS and the new drivers might have own “magnesium problems” in sound. I would not speculate at this point as I never heard them the new Fostex tweeters and I fine them as a good candidate.

Did anyone herd them? Did anyone come across any new interesting tweeters some my last tweeters frustrations?

Rgs,
Romy the Cat

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