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be wrote:

Actually as far as I can see from the picture and trying to estimate the location of the drivers in the horns: The 3 front horns are probably time aligned, meaning the drivers are lying on an circle with the center at the hight of the listener and the radius same as a certain listening distance. But maybe I'am wrong, one would need a measuring band to be shure.

I was thinking about it as well. The obvious lack of compliance with this idea of the upperbass horn might be addressed by this angling of the upperbass axis relative to MF, where the MF is a reference. Angling axis changed timing for a given distance. Yes it is possible for “outside” horns but it is absolutely impractical for channel that is in band-pass.

Anyhow, I do not know what the purpose of that long pipe behind the HF driver, it think it is juts a decorative. Here is what I think Odeon does in this speaker. It would be interesting is any German speaking person would learn something about them and to elaborate on the Odeons more.

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