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Old 17th September 2009, 03:58 PM   #1
JonasKarud is offline JonasKarud  Sweden
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Default My speakers

I've shown these speakers in another thread, but I thought that maybe there are other diy:ers that would like to see them.....

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Old 17th September 2009, 08:47 PM   #2
CharlieM is online now CharlieM  United States
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Hi Jonas,
You've obviously put a lot of thought into your design. I think your modular design and magnetic tape are really nice innovations. A few questions: I don't see any woofers-- are you running the esl's full range? What kind of tranny's? Bias voltage?
And most important: How do they sound?

Anyway-- GREAT JOB!!

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Old 18th September 2009, 01:50 AM   #3
mwmkravchenko is offline mwmkravchenko  Canada
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Default Very well thought out design!

You should be a very happy man. Beautiful job in design and execution.

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Old 18th September 2009, 04:31 AM   #4
DSP_Geek is offline DSP_Geek  Canada
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Good lord, what a beautiful set of speakers! I'm gobsmacked.
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Old 18th September 2009, 04:49 AM   #5
mrevie is offline mrevie  Australia
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Those really are something special! You gotta be proud of that!
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Old 18th September 2009, 06:19 AM   #6
chinsettawong is offline chinsettawong  Thailand
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Hi JonasKarud,

Nice speakers! You posted that the bias voltage was stepped up from the transformer and you didn't need to connect the bias voltage to another supply source. Can you give us more details on how you do that? It sounds very interesting.

Wachara C.
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Old 18th September 2009, 07:13 AM   #7
JonasKarud is offline JonasKarud  Sweden
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Thanks for the compliments!

Today I use a B&G Neo3 planar dipole tweeter for the top end. This allows me to drive the Esl with ten cheap ordinary, 220/9 Vac, 40x40 mm, encapsulated, circuit board power transformers up to appr. 5 kHz.

The transformer primaries are in parallel, their secondary in series.

The bias voltage is obtained by connecting a seven step high voltage ladder to the balanced output of the drive transformers via two 1,5 MOhm 2 watt resistors.

The input of the step up ladder is protected from voltage transients by a 220 Vac varistor. The output is connected to the front metal frame via six 10 MOhm resistors and three 1N4007 rectifier diodes in series. These rectifier diodes
are important as they keep the speaker charged when music passages temporarily become lower.

I've tested a number of sub and woofer configs, always ending not using them. The sound reminds of Audiostatic.
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Old 18th September 2009, 05:15 PM   #8
a.wayne is offline a.wayne  United States
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Hello Jonas,

Good job , nice looking speaker ......................

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Old 20th September 2009, 12:24 AM   #9
Andersonix is offline Andersonix  Sweden
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Those are really clever, Jonas. I like the raw industrial and floating in space design.

Also pleased to see this posted over here at diyAudio as well as the ML forum.
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Old 23rd September 2009, 03:21 AM   #10
poopydoopynoopy is offline poopydoopynoopy  United States
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sweet !
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