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Old 3rd July 2013, 08:22 PM   #231
solhaga is offline solhaga  Sweden
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Membrane with 6/2 folding ratio, 4/4 alu. Blue measurement with wave guide. Red is a 8/2-membrane:

Click the image to open in full size.

Improvements in hf (+20 dB @ 20 kHz) as predicted and higher lf cutoff (+100 Hz) as expected.

Vibrations? Yeah, sure!

Maybe it must be a three way system anyway
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Old 4th July 2013, 06:58 AM   #232
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You will get lower distortion with 6/2 alu/space I have tried it.

Bernt
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Old 21st July 2013, 08:45 PM   #233
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Hawthorne have a AMT that plays from 500hz.Dimensions of the diaphragm is mentioned in this post :Hawthorne Audio • View topic - John's Rainier and Little Tahoma Build

Bernt
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Old 21st July 2013, 09:43 PM   #234
solhaga is offline solhaga  Sweden
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That would be around 160 mm (high?) times 194 mm (wide) with 6,35 mm deep folds.
For sure, that must be the un-folded dimensions, or isn´t it this AMT?

Click the image to open in full size.
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Old 21st July 2013, 09:51 PM   #235
solhaga is offline solhaga  Sweden
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Default New magnete assembly

I will now try to experiment with a new magnetic structure.

This time it will be designed for a 60 mm wide and 160 mm high membrane.
The field gap is still 10 mm.

View from above:

Click the image to open in full size.

Rods will be laying down with a 10 mm spacing will a slighty rounded shape and 4 mm thick.

Here´s a imaginary inverted view from the side:

Click the image to open in full size.

The membrane will ba a lot easier to build and the grid will affect the sound less.
It will also be easier to make adjustment to the membrane once mounted.

Last edited by solhaga; 21st July 2013 at 10:14 PM.
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Old 21st July 2013, 09:57 PM   #236
solhaga is offline solhaga  Sweden
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Simulations:

Click the image to open in full size.

Click the image to open in full size.

A hint of the variations in the field due to the spaces between the rods:

Click the image to open in full size.
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Old 21st July 2013, 10:06 PM   #237
solhaga is offline solhaga  Sweden
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Baffled up they are really thin:

Click the image to open in full size.

Yes, I´ve made room for two aside:

Click the image to open in full size.

Close up of the grid:

Click the image to open in full size.
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Old 21st July 2013, 10:14 PM   #238
solhaga is offline solhaga  Sweden
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I have no membranes made yet, so I used one I got from båndsei:

This is how it measured compared to when it was inserted in the old motor:
(blue is the membrane in the old motor, green is the membrane in the "mk II" motor with a simple baffle)

Click the image to open in full size.
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Old 22nd July 2013, 05:33 AM   #239
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You are right about the dimensions on the Hawthorne AMT .But I dont think it is the unfoldet too.
I found another post with better Pictures:Hawthorne Audio • View topic - Silver Iris Reference AMT official thread

Bernt
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Old 22nd July 2013, 06:02 AM   #240
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by solhaga View Post
That would be around 160 mm (high?) times 194 mm (wide) with 6,35 mm deep folds.
For sure, that must be the un-folded dimensions, or isn´t it this AMT?

Click the image to open in full size.
Let´s says that the pleat width is 1,5 mm.
194/(1,5+6,35) equals 25 folds.
Looking carefully at the picture, couldn´t that be the case?
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