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Old 16th September 2011, 06:44 PM   #11
diyAudio Member
Join Date: Oct 2006
Location: Storvreta
Originally Posted by tmblack View Post
Great pictures.Are the shorting bars behind the tweeter ribbon?
How about the magnet structure for the woofer?
Sure is helpful, and finding the PDF would be sweet.
Not so much steel in it.
Why is the Duetta so heavy?
First of all, there is much steal and weight in the tweeter section. Believe me!
Next, the bass structure is so heavy You would not believe.
One person said that that's why they are so much better then Magneplanars from Magnepan. And that's so true.
You should know that the magnets themselves are quite heavy. Not to mention the very thick hole plate they are glued to.
If You try to knock on the hole plate in the back of the bass panel, it is totally dead and thus have NO resonance what so ever. That is VERY good indeed!
Try doing that on other planars. hehehe
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Old 16th September 2011, 08:30 PM   #12
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Join Date: Feb 2008
Location: Jackson,michigan
Maybe will this give you an idea,

Tweeter section,

2 - 2" x 3/16" iron plate.
48 - 1 7/8" X 7/8" X 3/4" ceramic magnets.
7 - 2 3/4" X 3/4" X 1/2" steel support bars.

Woofer panel,

1 - 1' X 4' X 1/8" preforated steel panel.

123 magnets in a 41 X 3 arrangement.

1 - 6" dia. and 2 - 3" dia. all copper inducters plus capacitor,resistor and other hardware.

And enough wood for 2 1/2 layers of 2' X 5' X 3/4" MDF !

Not much but it all adds up.

Last edited by geraldfryjr; 16th September 2011 at 08:32 PM.
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Old 16th September 2011, 08:37 PM   #13
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Join Date: Feb 2008
Location: Jackson,michigan
Yes, The shorting bars ar behind the ribbon.
I will Find the PDF for you.


I found another link of some dissassembled ones while doing some more digging, Enjoy !!!


Last edited by geraldfryjr; 16th September 2011 at 09:07 PM.
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Old 16th September 2011, 08:47 PM   #14
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Location: Jackson,michigan
Here is the link as it is in german but I ran it through Googles translator and it worked okay.


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Old 17th September 2011, 07:18 AM   #15
dheming is offline dheming  United States
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Location: Bay Area, CA
Originally Posted by geraldfryjr View Post
The Apogee's that I now have, Is what had inspired me to buy all of those magnets and I still have the two foot stack that I had super glued together for ribbon expriments.

I Wish I could get them apart so that I could utilize them for the bass panels ,But I haven't been able figure it out without damaging them yet.
Have you tried this: Removing Super Glue | Super Glue Corporation
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Old 17th September 2011, 08:14 PM   #16
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Location: Jackson,michigan
Thanks, I had forgot about using acetone next time I get a new can I will try it.
I have been meaning too do it in the past but the concept never occured at the same time as when I had some acetone.
It is two very large stacks about 2 feet long and each stack is 5 or 6 layres deep ,glued to some 3/4" particle board,so it is not going to be easy by any means.
I had just recently relocated it in my huge pile of stuff this last summer.
I made it sometime in the mid 90's and it is still intact.
I will post a picture of it soon.

Thanks! jer
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Old 17th September 2011, 09:37 PM   #17
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Are you building new frames, as well? The general consensus among Maggie users seems to be that replacing the MDF frames with hardwoood yields great results, something I'm going to try with some custom Acoustat frames. Not sure if the same applies to Apogees, though.
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Old 17th September 2011, 09:50 PM   #18
a.wayne is offline a.wayne  United States
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Originally Posted by geraldfryjr View Post
Here are some close ups of the ribbon and magnets, I tried to get an extreme closeup but the Focus was giving me a bad time!
But I can at a later time as I have a few ways to get almost to a microscopic level with it.
These are Duette's.

I got the info by doing some Digging and it was sent to me email from a fellow DIY'er earlier this year in a PDF via Email.
I will dig it up for you if you wish.

I hope these are of some help to you!

Enjoy, Jer

Interesting to note ! ..

The returns are run outside the field, something I have suggested on here many times before. Most of the builds here have the return running in the field , it is the wrong way of doing it ...

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Old 18th September 2011, 04:23 AM   #19
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Join Date: Feb 2008
Location: Jackson,michigan
No,I am not going to redo the frames,
I just want to some how retension the woofer section if I can as they have a slight rattle.
I don't want to damage the original Diagphram or have to try to replace it.
Trying to locate just a 12' X 18" X 1mil piece kapton may prove to be very hard to acomplish not to mention the cost.
I have some 1" and 3" or 4" stuff and it is an extremely durable material.

It has been said that their edges are suspended by foam and all of the foam that exsisted has now withered away.

Unfortunately there is no easy way to get to the backside so that I can reform the creases and redo the edges.

Inorder to do this I may have to cut the MDF frame inorder to lift out the magnet structure and then remount the two pieces on a new backing piece.

I am not quite sure yet on the process I will choose yet,But it might be the only way to go as I really don't want disturb the diagphram and its mounting frame and geometery as it is not that badly damaged yet and still works.

Also when I first got them home I didn't have them properly setup and they were just leaning against the wall.
And the extra backwave preasure could have been the cause of the rattling as well as from being overdriven abit much as they are 14 feet from my listening position and suffered greatly from dipole cancelation in this configuration.

There as also the possibility that there may not be anything wrong with them because the amp ( an Ashely FTX-2000 ) started to devolep some probelms and eventualy quit working on my main stack of speakers and that was when I had to switch everything over to my Crown DC300a.

I agree, The returns should be run outside of the magnetic field as to not modulate the field even as slight as it may be, Also I believe that some form dampening may occur to the signal as well if it is routed within the field.

The returns on the ribbons are run along the tops of the magnets on their centers, Although they are not directly in the magnetic circuit, IMHO I think that it is still to close for comfort and that it is just heavy gauge aluminium tape stuck directly to the magnet with no insulating material between the conductor and magnet assembly.
I find this to be a pis poor design although it has been working since 1987 when they were built.

Any Thoughts? jer

Last edited by geraldfryjr; 18th September 2011 at 04:32 AM.
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Old 18th September 2011, 04:36 AM   #20
a.wayne is offline a.wayne  United States
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Currently mine are built very similar to the apps,(frames) just direct, (similar to there fullrange unit) no returns at all , wire wound vishay resistors on heat sinks are used to a bare minimum, for 1.2 ohm loading mid/twt and they are coupled to a 4 ohm dynamic bass driver -3 db down at 38 hz..

Drives the amps batty , but the sound is ......
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