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Old 24th December 2010, 06:35 PM   #21
john65b is offline john65b  United States
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I want to say 30ga? The resistance was very close to the stock Aluminum.

For glue, I always used DAP Weldwood (Home Despot) - they are PERMANENTLY glued with that stuff. Just don't make a mistake...
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Old 26th December 2010, 11:59 AM   #22
SM7UYJ is offline SM7UYJ  Sweden
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The project has taken a new turn!

Click the image to open in full size.

I found the whole construction to be a bit odd and I have some noice in both the rewired panels - not from lose wire, but fron the film hitting the magnets due to skew metal plates => I'll redo the whole thing!

The plan is to use 19mm MDF 550 x 1800mm and put on some new 12.5m Mylar.

Perhaps I'll find time to mill the holes to night and test mount the plates.

/Roger
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Old 26th December 2010, 03:29 PM   #23
Krisfr is offline Krisfr  United States
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Does anyone know of a thread here on DIYA that shows the BASIC layout of the Magnapan speakers in DETAIL. I have seen lots of photos but no detail of how it all fits together. The placement of the magnets with respect to the aluminum foil and the copper wire and such, maybe I am just dense in the head and I am over complicating it.
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Old 26th December 2010, 03:33 PM   #24
john65b is offline john65b  United States
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Really quite simple.

see

Information on the technology behind Magnepan's stereo speakers
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Old 26th December 2010, 03:44 PM   #25
Krisfr is offline Krisfr  United States
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I do not see the copper wire running around the pictures there. Isn't that a integral part of the SYSTEM?
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Old 27th December 2010, 02:53 AM   #26
john65b is offline john65b  United States
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In pic, you will see the ribbon. For the main panel, instead of a ribbon, you have the wire glued to mylar, and between magnet strips.
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File Type: gif 05.gif (22.5 KB, 280 views)
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Old 28th December 2010, 08:03 AM   #27
SM7UYJ is offline SM7UYJ  Sweden
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New try!

First I tension the Mylar using a fish scale and strips off duct tape.

Click the image to open in full size.

The film is streached to abt. 3.5kg/10cm

Click the image to open in full size.

/R
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Old 28th December 2010, 08:14 AM   #28
SM7UYJ is offline SM7UYJ  Sweden
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I use extra strong double sided tape on the spacers. I've used this tape with good results on my ESL-panels and it makes the process so much easier than using glue and having to wait for it to cure.

Click the image to open in full size.

The frame placed on the streched Mylar.

Click the image to open in full size.

And here is the result after cutting the film along the spacers.

Click the image to open in full size.

I heat treated the film after it was attached to the spacers to increase the tensioning a bit more.

Not shown are the strips off steel sheet metal glued on top of the Mylar and the spacers to help hold the film tensioned. (like in the original)

I tried to glue the wire by hand to the Mylar - It works fine, but I think I'll make a simple jigg as I find it to time consuming!

/R
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Old 28th December 2010, 08:47 AM   #29
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Hi SM7UYJ,

Nice! Keep the photos coming!

Wachara C.
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Old 17th January 2011, 05:03 PM   #30
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Default Electrostatic, Magneplanar and rotary woofer

Martin Logan Summits with Magneplanar Tympani IV bass panels (modified) and Eminent Technology TRW-17 rotary subwoofer. An awesome combo!!!! IMG_0740.JPG

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