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Old 24th March 2004, 11:46 PM   #1
diyAudio Member
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Location: stockholm
Question DIY for a blatthaller speaker?

I found this tex on a historypage, and for me that works with PA that sounded interesting..

The ”Blatthaller” was developed in 1924, also at the Siemens & Halske Laboratory, by H. Riegger and was the first loudspeaker to be operated electrodynamically according to the principle of the plunger coil, with a large-area ”piston membrane”.

This development marked the beginning of the real age of large-scale public address systems in Germany. The ”Blatthaller” was used for the first time for a major broadcast in 1925 at the official opening of the Deutsches Museum in Munich. In later years also, up until 1933, it was used successfully as the so-called ”Giant Blatthaller” for broadcasting speeches at numerous events. With the largest model ever made, distances of several miles could be covered under the right weather conditions. However, the stability of the rectangular piston membrane, measuring approximately 15 x 35 cm and made of lightweight metal, was slight and its mass was too great for high frequencies.

Does anyone know of a diy project for a poweful blatthaller?
or atleast a good description on how the original worked and what the magic behinds its astonishing sensitivity of 25% was?
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Old 25th March 2004, 08:03 PM   #2
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Wow the Blatthaller!!!!!!

From the this came the Orthophase design of drive unit developed by Gerard Gogny and Marcel Poutot in the mid 1950's.

Then in the late 60's early 70's Ernst Spiteri developed the ESL Orthophase .

I have a pair of the GeGo OR3 W4 Orthophase of 1959.

I also have a pair of ESL Orthophase OR27 by Ernst Spiteri.

L' Audiophile published an article on the Orthophase and its history in issue No: 48 juin /juillet 1989.

Also a page or two in Gilbert Briggs Book More About Loudspeakers 1963 pages 125 and 126.

These orthophase sound fabulous.

Unfortunately i do not believe that ESL are in business anymore.

Ernst also made some of the craziest turntables arms and valve amps that i have ever seen. Parallel tracking arms being one of his passions.

There is a crazy french web site which shows a very crazy french horn system and in the photo is Ernst himself.

He used to have a very upmarket shop in Paris in the 70's before retiring to Bretagne.

He was a lovely bloke and was very kind to me on the 2 occassions that i visited him .
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regards David
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Old 26th March 2004, 08:11 AM   #3
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Thanks for the information
But i tried to search on the keywords in your message, but the only thing i found was your page at audioasylum.

But since i would like to build a small linearray out of such speakers, so do you know how they worked?
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Old 26th March 2004, 04:19 PM   #4
medum is offline medum  Denmark
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just googled around:
look here
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Old 26th March 2004, 09:20 PM   #5
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Yes, i have seen it.
Unfoutunately the picture doesnt reveal any details about the construction that makes the difference from ordinary magnetostats.

Anyway, i have been thinking of winding a "coil" on the back of a stiff membrane with some hefty magnets both infront as well as behind it, maybe it will work..
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Old 27th March 2004, 10:02 AM   #6
medum is offline medum  Denmark
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electroaudio - of course you have seen this too, but maybe other members haven't:

text in sweedish - should'nt be a problem!

just schroll down a bit, and you will see more details.
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Old 27th September 2010, 07:05 PM   #7
hahfran is offline hahfran  Germany
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Recently I spotted a really huge Blatthaller in a technics museum.
I don't think it is a DIY project although its specs are very interesting:
resonant frequency 15 Hz
maximum sound pressure 120 dB
distortion at 100 dB, 100 Hz 3%
These figures were measured by a certain physicist Prof. Trendelenburg
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