My speakers

JonasKarud · 17th September 2009, 04:58 PM

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

http://picasaweb.google.com/jkarud/DropBox#

CharlieM · 17th September 2009, 09:47 PM

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!!

Charlie

mwmkravchenko · 18th September 2009, 02:50 AM

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

Mark

DSP_Geek · 18th September 2009, 05:31 AM

Good lord, what a beautiful set of speakers! I'm gobsmacked.

mrevie · 18th September 2009, 05:49 AM

Those really are something special! You gotta be proud of that!

chinsettawong · 18th September 2009, 07:19 AM

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.

JonasKarud · 18th September 2009, 08:13 AM

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.

a.wayne · 18th September 2009, 06:15 PM

Hello Jonas,

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

regards,

Andersonix · 20th September 2009, 01:24 AM

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.

poopydoopynoopy · 23rd September 2009, 04:21 AM

sweet !

17th September 2009, 04:58 PM	#1
JonasKarud diyAudio Member Join Date: May 2008	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..... http://picasaweb.google.com/jkarud/DropBox#

18th September 2009, 02:50 AM	#3
mwmkravchenko diyAudio Member Join Date: Jan 2002 Location: Perth Canada	Very well thought out design! You should be a very happy man. Beautiful job in design and execution. Mark __________________ Mark

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17th September 2009, 09:47 PM	#2
CharlieM diyAudio Member Join Date: Feb 2008 Location: Savannah, GA	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!! Charlie

18th September 2009, 05:31 AM	#4
DSP_Geek diyAudio Member Join Date: Aug 2003 Location: Santa Cruz, California	Good lord, what a beautiful set of speakers! I'm gobsmacked.

18th September 2009, 05:49 AM	#5
mrevie diyAudio Member Join Date: Jan 2009	Those really are something special! You gotta be proud of that!

18th September 2009, 07:19 AM	#6
chinsettawong diyAudio Member Join Date: Jun 2006	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.

18th September 2009, 08:13 AM	#7
JonasKarud diyAudio Member Join Date: May 2008	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.

18th September 2009, 06:15 PM	#8
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Hello Jonas, Good job , nice looking speaker ...................... regards,

20th September 2009, 01:24 AM	#9
Andersonix diyAudio Member Join Date: Jan 2004 Location: Silicon Valley	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.

23rd September 2009, 04:21 AM	#10
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	sweet !

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