New S/3100 ?

[Bernard Wolf]

http://cgi.ebay.com/ws/eBayISAPI.dll...ayphotohosting

Do these ever look like my 3100's ..

[Hoerninger]

Klangfilm from 1934: Europa Junior KL43004 (pair)
Lots of pictures - lots of money (reserve not met)!
____________
Peter

[Bernard Wolf]

I am really intrigued by how similar these look to the S/3100.. from the front that is ! What is really surprising is that the horns look to be asymmetrical.. this in the age of mono.. what gives with that ? Could it be they were meant to be used in pairs ? Or is the photo just giving that illusion?

[Hoerninger]

What is really surprising is that the horns look to be asymmetrical.. this in the age of mono..

Yes, the form is asymmetrical. I have not found any information about this form. But it should be considered that KLANGFILM produced cinema speakers. Speakers on stage are overhead the audience and so it might be intended that the sound does not come out straight. Concerning the Euronor there is a detailed description about sound distribution of the high frequency horns, Ingenieurs were aware of the problem.

Attached are two pictures of
- Europa Junior KL43004 (ca.1934)
- Euronor (with big bass horn, ca. 1943)

Concerning the suspension of the bass driver (19 inch membran diameter) of the Euronor I found this:

The bass system used in the EURONOR loudspeaker combination of Klangfilm GmbH. contains a membrane with a diameter of 48 cm, tuned to 22 Hz. Since the extraordinarily small reset force of the clamping is not capable of holding the weight of the membrane, complete with voice coil, the system axis is laid out perpendicularly with the membrane suspended by its centre to a spiral spring whose natural oscillations are damped by a cylinder padded on the inside and enveloping the spiral.

AES / A History of Audio Engineering and Magnetic Recording Before 1943
Headphones and Loudspeakers
Martin Schildbach
SiemensAG, Frankfurt/M, Germany

Added: max excursion 2 cm; weight 130 kg

All information I have found here:
http://klangfilm.free.fr/index.html
___________
Peter