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tmblack 15th September 2011 04:14 PM

Apogee Speakers Construction
Looking to understand the operation and repair of Apogee ribbon speakers.
Examining the Apogee Duetta Signatures, I see the magnets are ceramic.
The tweeter is a true ribbon, with magnets approx 1.25" spaced and sized 2"x1"x0.5" approx and stacked in 2 layers on each side.

Anyone know how the Stage tweeter is constructed?
All I know is it is 0.7" wide and 26" long but I haven't seen one up close.


tmblack 15th September 2011 04:34 PM

1 Attachment(s)
Here is the rear view of an Apogee Stage speaker. The bar magnets are easily visible for the woofer section.

geraldfryjr 15th September 2011 05:04 PM

The magnets for the ribbons on mine measure 1 7/8" X 7/8" X 3/4".

They are the same size but twice the thickness of the ceramic magnets that I had stockpiled from Radio Shack many years ago.
They also seemed to have the same strength per thicknes as well.

I have also recently aquired some of the same material at a local hardware store that measure 1 7/8" X 7/16" X 3/8" rather cheap and I was thinking making a desktop scale model of the Duette's aswell using them.

But I would much rather use some Neo's for them as it would increase the eficeincy greatly as per size.

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. :(

If there is any thing else you need to know about them Mine are in sad shape and the covers are off of them, But they are rebuildible and I will refurbish them when I get the room to work on them someday.
They still work but the bass panels rattle and seem to have lost some of there tension.
I have the current Info on how to repair them but the issue is the amount of room I have to work on them right now.

Jer :)

tmblack 15th September 2011 05:18 PM

Do you have the Stage Jer? I would like to see some images of them with the covers off.
Where did you get information on how to repair them?
I'd like to see that.
I did not take the covers off the Duetta so the magnet size is really approx.
I like your idea of building a desk top clone.


geraldfryjr 15th September 2011 05:44 PM

6 Attachment(s)
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 :)

tmblack 15th September 2011 05:58 PM

I like to see the steel structure. It appears to form a C shape an is closed at the top and bottom, meaning the center is cut open for the ribbon?
Can you take more pictures of the tweeter bottom and also the woofer section?

Very useful so far.

geraldfryjr 15th September 2011 06:53 PM

8 Attachment(s)
Here are some more pics and like I said before sad,sad, shape. :(

The magnetic circuit for the ribbon is open and there are No shorting bars at all anywhere in the structure.
the magnets are attached to 1/8" iron plate bars and the spacers are black plastic or phenolic or something.

I don't know if any glue was used or not as I haven't gotten into them very far yet.

Sorry the one picture that you wanted came out blurry but you can still make it out I would have taken another shot but my batteries died and I had to resort to an old an weak set in order to download the pics, Sorry. :(
I will try to get some more when I get a fresh charge on them.

Jer :)

P.S I stand corrected ,There are 7 1/2" X 1/2" shorting bars on the back side of the ribbon structure spaced evenly along the length of the ribbon I will flip it over and get a picture for you.

geraldfryjr 15th September 2011 07:39 PM

6 Attachment(s)
Here is the Backside of the Apogee Duette showing the magnet structure of the panel.
Note the seven shorting bars that I forgot that they were there! He,he

It is a very simple system ,But yet very Ingineous for the time I sure would like to hear a set of this made with some Neo's.

My biggest gripe and probably the only one was that it takes everybit of 1000watts or more to make them really sing nice .

Mine were originaly paired with some Aragon amps.
Unfortunatley those disappeared,Although I do still have the Aragon preamp for them.

I used a Crown DC300-A's on the ribbons and an Ashely FTX-2000 on the bass panels and it was just enough to make them sound decent but not exetremly loud but the clarity was unlike anything that I have ever heard before at that point in time. :)

Jer :)

JarreYuri 15th September 2011 08:54 PM

I agree! They DO sound very nice, indeed.

tmblack 16th September 2011 06:30 PM

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?

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