Ushlues the year was 1924 not 1923. I gues what make this sound special would be the combination of an open-baffle with a full-range fieldcoil driver. Thanks metralla , a friend just send me the same thread and I will experiment with this type of open-baffle. It's easy to make and you're supposed to get deeper bass and a wider soundstage. I have them in a Phy-hp type of baffle (5feet by 5). I'm suppose to get another pair that I will use in a close cabinet (the one they sell for 9500euros). This would be good to compare but once you've listen to an o-b it's hard to listen to a close box and you keep searching for the sound characteristics that you're use to listen in your o-b (openess-minute details in the sound -very dynamic - coherent-realism and the voices..). It's a very addictive sound,without any fatigue.I'm really gladto have found these. Now the only thing left is to upgrade my components(I'll be searching , here, on Audiogon for a decent cd player and a good tube amp). I saw that there is another thread that has the same subject with the visaton driver. It's really something that Audiogoners should be looking into. I'm really an happy cat.
