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Mark,

It is hard to say. I owned T90A sometimes in 2001-2002. At that time I was going through the drivers like crazy and T90A was just one of them. Looking from now I do not think that I gave to many drivers a chance as I did not “work” them trying to get best out of them. I do not remember that T90A gave me any problems, in fact I had the most expensive Fostex tweeter (T5000 or 7000) they had available at that time but I preferred T90A (it was the least expensive Fostex tweeter then).

You see, all those conversations about what I liked or do not likes make scene only in context of the MF drivers that I used at that time. A tweeter is not a self-contained element. A tweeter is a complimentary component for MF channel and they must work together. In the very beginning of 2002 I switched from many other MF drivers that I used before to Vitavox S2, and my first year with S2 driver I was “fighting” with it, learning how to make it to sound right. The Fostex T90A came to me right before or in the middle of the “S2 fight”, so I might be clueless what I was getting then.  In addition I do not know the GPA drivers. I experimented with Altec’s 288 and 290 but never had the GPA drivers. They shell be similar but you never know. JBL and Tannoy nowadays and 40 years back are kind of “similar” drivers, although they are very much not be the same…

The RAAL TearDrop tweeter was an interesting push up. It was an opportunely for me to see what 109dB sensitive ribbon is all about. In addition I was looking for a very narrow vertical window to let the tweeter in its time-aligned position to shoot between the horns. From what I see ribbons have advantages over compression driver in HF region. With each single hertz the frequency goes down the ribbons loosing their advantages and compression drivers take over…

Anyhow, I do not think that I might be a good source for you to learn about T90A. In past Madidound was offering to send drivers to try, they might still do it. If so, then grting from them the T90A for a week or two shell answer all your questions. Make sure that the T90A is scrupulously time-aligned and it’s axis is meticulously paralleled to the 288’s axis. 90% of the problems with tweeters out there are about the people do not align them properly….

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