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Old 12th January 2013, 11:58 PM   #121
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
So what about re-using my ribbon configuration?
Swopping the right magnet side of the left speaker with the left magnet side of the right speaker (I must be very careful if I do that):

Click the image to open in full size.

Click the image to open in full size.

Resulting b.n:

Click the image to open in full size.

Not bad, it will have to be narrow driver though.

b.t looks good:

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I must reverse the polarity of the right speaker of course.
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Old 13th January 2013, 08:37 AM   #122
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Setups with weaker field in the center might be nice for diaphragms with smaller folds in the center. i.e. transitioning from a midtweet AMT to tweeter AMT in the center.
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Old 13th January 2013, 08:48 AM   #123
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by SEdwards View Post
Setups with weaker field in the center might be nice for diaphragms with smaller folds in the center. i.e. transitioning from a midtweet AMT to tweeter AMT in the center.
Well that´s a great relief, so it can even be a desired setup.
But wouldn´t the level be lower for the tweeter in the middle then, having less air to compress/decompress?
EQ?

If the folds are the same all over, but the aluminium strips are narrower in the middle, the same force will be applied to all folds.

Last edited by solhaga; 13th January 2013 at 09:02 AM.
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Old 13th January 2013, 09:10 AM   #124
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I was inspired by a Danish guy LGrau.
He has done some work with AMT too.From the bottom of this page and on:
HIFI4ALL Forum: Lyd laboratoriet
He tried first like your,s latest model.Didn't like resonanses from the system.

Bernt
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Old 13th January 2013, 09:16 AM   #125
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I am speculating, but I think that level matching could be achieved by finding the right combination of pleat width and depth. Deeper pleats have more mass to be moved so the stronger field will help at the edges. If there is more of a gap between pleats the air is loaded less efficiently. It looks like you could juggle all the variables if you had no day job.

We can dream.

Quote:
Originally Posted by solhaga View Post
Well that´s a great relief, so it can even be a desired setup.
But wouldn´t the level be lower for the tweeter in the middle then, having less air to compress/decompress?
EQ?

If the folds are the same all over, but the aluminium strips are narrower in the middle, the same force will be applied to all folds.
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Old 13th January 2013, 09:17 AM   #126
solhaga is offline solhaga  Sweden
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@båndsei: Yeah, I guess it is all about keeping the cavaties shallow.
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Old 15th January 2013, 03:02 PM   #127
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Ok, so I made a test diaphragm from packing tape to see if it will make noise. Now I'll hunt for appropriate materials.

I noticed that there is mylar with alu on both sides - that might be pretty useful for etched traces with higher resistance without having to use the epsilon layout.
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Old 17th January 2013, 02:16 PM   #128
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Looking at the ADAM diaphragm again (with the 2 traces), I wonder whether this is for better hinging as much as for resistance. It looks like one of the pictures in Heil's later patents about the hinging of the pleats.
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Old 17th January 2013, 05:13 PM   #129
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It could be for better powerhandling.Longer"wire"=thicker "wire". And more weight.
I am making horns now ,and it looks good regarding FR.

Bernt
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Old 18th January 2013, 03:34 AM   #130
OB-1 is offline OB-1  Australia-Aboriginal
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Hi, I have been following this thread with interest and I came across this link from Beyma,
Beyma Professional Loudspeakers look for the document, AES_129_2010_SANFRANCISCO_Contributions_improvemen t_Pleated_Loudspeaker.pdf
I thought it would be of interest as I have not seen it before regarding the TPL150.

NBF
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