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el`Ol wrote:

I am not ideologic, and if a driver that can be used from 1kHz up is only state of the art from 5kHz up I won´t hesitate to cross it there.

There is a difference between “can be used from 1kHz” and “a driver sound at 1kHz  as good or better than other diver”. It is not about where to cross but how good it sounds before you cross it. I my book the lower ribbon goes the more compromised it sounds.

el`Ol wrote:

Maybe it has something to do with developer´s pride to extend the frequency range as far as possible. I never heard a RAAL, but I believe Alex is also not free of that when he claims the natural x-over frequency for a large ribbon is 1.5kHz.

Alex and I have major disagreement about it. I believe that quality of sound from ribbons is back proportional to frequency. Alex feels that it is a bogus believes and he considers that if ribbon is properly implemented for a given operation mode then it might be an effectible wide bandwidth driver. Certainly he has more foundation to support his believe but I’m still willing to maintain my view. Even if Alex is capable to make a decently sounding MF ribbon then… why do not use 2 ribbons: one is optimized for MF and another is optimized as a tweeter – to serve HF only. It is like you need two different channels to best produce 30Hz and 300Hz you need two different channels (transducers) to best produce 1kHz and 12kHz. Perhaps it is my ignorance but I never heard any seriously-sounding MF-HF transducer - nor I ever have seen a need for it…

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