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Old 12th September 2017, 08:23 AM   #1
solhaga is offline solhaga  Sweden
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Default SLAM!

On the last pages in my old thread, Yet another DIY AMT, I were on the verge of starting to work on a new AMT motor.

But now when I'm actually starting, I want to make a clean start with a new thread.

This motor will be 150 cm long, that is how far my stash of pole pieces and magnets takes me.

I still have my doubts of an AMT line source, but the motor can be used for other configurations.

So Solhagas Long AMt is finally coming up!

First I need to do some OnShaping...

Last edited by solhaga; 12th September 2017 at 08:53 AM.
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Old 13th September 2017, 06:33 PM   #2
båndsei is offline båndsei  Denmark
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Do you have pole pieces for 2 AMT´s ?
This must be 3 or 4 membrane´s ,or what
Nice to hear from you again.

Bernt
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Old 13th September 2017, 09:13 PM   #3
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by båndsei View Post
Do you have pole pieces for 2 AMT´s ?
Yes I have. But I'll will not mount any pole pieces on the back.
I haven't measured or heard any drawbacks of that approach.

Quote:
Originally Posted by båndsei View Post
This must be 3 or 4 membrane´s ,or what
Bernt
It'll probably be a MMTMM configuration. The four Ms might be my usual full range membrane but cut off in the highs.
The tweeter will then be a new 45x45 mm AMT.
Hopefully this configuration deals with the vertical dispersion better.

Quote:
Originally Posted by båndsei View Post
Nice to hear from you again.

Bernt
Thank you, Bernt. Been busy building my CABS (Controlled Acoustic Bass System) system. Like all good things in loudspeakers - it's Danish.
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Old 14th September 2017, 10:37 AM   #4
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by solhaga View Post
Yes I have. But I'll will not mount any pole pieces on the back.
I haven't measured or heard any drawbacks of that approach.


It'll probably be a MMTMM configuration. The four Ms might be my usual full range membrane but cut off in the highs.
The tweeter will then be a new 45x45 mm AMT.
Hopefully this configuration deals with the vertical dispersion better.



Thank you, Bernt. Been busy building my CABS (Controlled Acoustic Bass System) system. Like all good things in loudspeakers - it's Danish.
Would a series of smaller AMT "stacked" have the same characteristics as a single large verdion?
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Old 14th September 2017, 10:45 AM   #5
solhaga is offline solhaga  Sweden
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The simple answer is: no.
Mostly it will be less low frequency response and for sure the vertical dispersion will be different.
And a lot of useful membrane area will go to waste as there are return paths on the top and bottom of each AMT that could be 2 cm per AMT.

Are you thinking of letting all AMTs be tweeter size, that is 45x45 mm?
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Old 14th September 2017, 11:02 AM   #6
anji12305 is offline anji12305  United States
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I'm thinking of the original "Great" Heil AMT.

Those had an vertical exposure near 15 cm.
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Old 14th September 2017, 11:13 AM   #7
solhaga is offline solhaga  Sweden
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Ok.

Well, it can be worth a try.
What do you think it'll gain?
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Old 24th September 2017, 06:42 PM   #8
solhaga is offline solhaga  Sweden
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The result of a days work with OnShape.

Magnet and pole piece:

Click the image to open in full size. Click the image to open in full size.

I'm doing a section of four pole pieces and then I'll multiply to the full AMT, so I need a smaller part of the frame:

Click the image to open in full size.

Pole piece hold:

Click the image to open in full size..

Spacer to hold a bar between the magnets and the bar itself:

Click the image to open in full size. Click the image to open in full size.

There's a big chance that I can get 3D printed pole piece holders:

Click the image to open in full size.

All the above in one four pole pice section:

Click the image to open in full size. Click the image to open in full size.

And...

SLAM!

Click the image to open in full size. Click the image to open in full size.
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Old 25th September 2017, 04:02 PM   #9
WrineX is offline WrineX  Netherlands
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Nicee i am looking forward to this project Nice to hear from you both will keep an eye on this one !
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Old 25th September 2017, 04:49 PM   #10
solhaga is offline solhaga  Sweden
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Thank you, Wrinex.

Did you by the way visit any of the Piet Mondriaan exhibitions this summer?
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