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Old 15th October 2012, 01:49 AM   #1
lpd is offline lpd  Canada
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Default Acoustat panels

I picked up a pair of acoustat 8" panels (5 wire) with a copper ring around outer edge of the membrane inside the stator. Anyone seen panels like this?
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Old 15th October 2012, 11:01 AM   #2
tyu is offline tyu  United States
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No there not stock....Thay had to be diyed....an to make work there had to be new coating add...can you post pic.....thanks an goodluck
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Old 15th October 2012, 04:14 PM   #3
lpd is offline lpd  Canada
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I can post a pic later this night.
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Old 15th October 2012, 06:52 PM   #4
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Quote:
Originally Posted by lpd View Post
I picked up a pair of acoustat 8" panels (5 wire) with a copper ring around outer edge of the membrane inside the stator. Anyone seen panels like this?
That does NOT sound like anything ever made at the factory. A photo would be helpful, but based on your description, I am not sure why this would have been done. Perhaps a misguided attempt to more thoroughly connect the conductive coating to the bias supply? I seriously doubt that would be helpful to the performance, it adds moving mass to the diaphragm, and leaves exposed high voltage. Proceed with caution.
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Old 15th October 2012, 07:12 PM   #5
lpd is offline lpd  Canada
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Here is a link to the builder....

http://db.audioasylum.com/mhtml/m.ht...20110618121119

Used a lighter membrane, and copper ring to attempt close to sound lab panels. I will post pics this evening. I haven't tried them yet but they look well designed.

Last edited by lpd; 15th October 2012 at 07:18 PM.
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Old 16th October 2012, 03:07 AM   #6
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On that forum, BOpenshaw wrote:

"The speakers can be upgraded to repair most of the problems, a thinner diaphragm can be installed, a lighter conductive material can be used on the diaphragm, a pure copper charge ring can be installed around the diaphragm, you can break up the diaphragm to eliminate the single large drum-head resonance, (make the speaker as close to a Sound Lab as possible) "

The copper ring bit has been discussed here on DIY as a way to prevent *other* coatings than Acoustat used from ending up having the connection to the bias voltage fail...

Sounds like the builder has sectioned the cell into several elements, like maybe ML does.

And, apparently he uses a thinner, lighter diaphragm material and a lighter coating.

In one of his posts he shows that he does not know the particulars of the Mk-121 Medallion interface, or how it works differently than the "regular" interface.

But, imo, if they are made well, then they ought to work ok as ESL cells, they're just not Acoustats. They are other potentially ok ESL cells.

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Old 16th October 2012, 04:39 AM   #7
lpd is offline lpd  Canada
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Yep that's it. One panel has a tear in the membrane not sure if I can repair all though these panels can be split as they are screwed together. Maybe a test panel for me to learn the art of building. I will post pics later.
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Old 16th October 2012, 11:41 AM   #8
tyu is offline tyu  United States
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Thanks for the link....great info...
I have Acoustat panels apart...thay can be pop apart...
I have Not used the felt on the back for years ...i find it eats to much of the top end... i put tape on the back....works great...gives the panel ridgdy...an a much better top end...there are mods that can be done to the 121 interfaces to make these speaker as good as one can get new today or Diy....
The bias is the place to start...Dont over look the Bias....get the bias setup right an you then can move on to the other steps...In the end the Bias is all a ESL is....I set the bias up so like with the SL you can set it....My bias is in it own boxs an can be set from 4-7k....goodluck
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Old 16th October 2012, 08:37 PM   #9
lpd is offline lpd  Canada
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Unfortunately one panel has holes and needs repair. Not sure if this is my skill set. The panels are screwed together, easy to pull apart, but replacing and coating a membrane looks a little more tricky.
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Old 16th October 2012, 09:24 PM   #10
tyu is offline tyu  United States
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There you have it....i have not put any new mylar or coating on any Acoustat panels...
I just get more Acoustat panels....i like to use only 9" panels my setup is 3ea 9" pre side...best sound i have got out of any Acoustat panel setup....i have had theXs with the tube amps...1s,2s,1+1s2+2sM3,M4,1100....an have more panels than i need at all times.....I have ML an had SL A1...the Acoutats have been around for over 30years..for me...
Long live Acoustats....goodluck
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