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Old 3rd February 2005, 02:29 PM   #1
Joules is offline Joules  United States
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Default Inside a Ribbon Tweeter ?

Has anybody ever taken apart a ribbon tweeter?
Ribbons such as the Ravens, Arum Cantus and the like.
What's inside? What is the air chamber like?
I've been inspired by the likes of dhenryp of this board, to try and build a ribbon tweet. I have most of the design issues resolved but I am unsure how the acoustical volumn is handled, so as to reduce unwanted backwave interferrence.
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Old 3rd February 2005, 04:14 PM   #2
Pan is offline Pan  Sweden
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Treat as any other "boxed" speaker.

The Raven ribbons have a very simple design for example.

I would try a slice of fiberglass against the backwall and sheep wool loosely stuffed in the middle of the chamber.

/Peter
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Old 3rd February 2005, 04:45 PM   #3
dhenryp is offline dhenryp  United States
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I think the biggest problems would be response anomolies caused by resonances of a back chamber and the reflected back wave. Small-ish chambers can have modes in the tweeter's range caused by the physical dimensions. Another disadvantage of a small chamber is that you have to work harder to abosrb the back wave in a small space. Almost all commercial ribbons I've seen use the back and side walls of the chamber to complete the magnetic path. They can't make it too big without paying a big weight/cost penalty for all the extra steel.

One big advantage of the open-back design I'm using in the other thread is that you can make the box behind it as big as you want and stuff as much sound absorbing material as you want. Alternately you could run it as a dipole. One option that I'm strongly considering is no box in the back, but a fairly thick layer of sound absorbing material instead. The advantage is that you should be able to absorb a good deal of the back wave. Hopefully, whatever is left won't give so much of a dipole effect that it makes it hard to match to box mid/woofs.

Please don't flame me about thinking out of the box and going dipole! I'm worried that they might produce an exagerated sound stage in my HT. One last thing; I don't think the 36 mid-woofs I already have would be good for a dipole. I might try diploe but if it it doesn't work out, this approach could help.
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Old 3rd February 2005, 05:33 PM   #4
Joules is offline Joules  United States
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I have listen to some Raven R1's and thought they were absolutly delightful.I would "assume" other examples of true ribbons from the likes of Raven, Arum Cantus and others sound as nice or better. All of these ribbons have a simular closed chamber be hind the ribbon. some how they manage to reduce back wave problems to a manageable degree. I am very concerened with efficiency (don't flame me about semmantics, you know what i mean) baced on the above I think it might be easer to deal with the back wave in an efficient magnetic design than to have no backwave problems and an inefficient mag. design. Alltho I'm very interested to see how the "open back's" turn out.
Stuffing the backs with fiberglass and wool would be my first thought too.
but I would like to see how it's done before I reinvent the wheel.
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Old 3rd February 2005, 06:34 PM   #5
dhenryp is offline dhenryp  United States
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Just to clarify; My "flame" request was not aimed at you Joules. I wanted to avoid being calateral damage in the Dipole/Box religous wars that sometimes flares up around here.

Good Luck.

Denis
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Old 3rd February 2005, 09:21 PM   #6
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Dipole ribbons are good. Listen to the Magneplanars for a good example.

Grey
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Old 3rd February 2005, 09:37 PM   #7
Joules is offline Joules  United States
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Quote:
Dipole ribbons are good. Listen to the Magneplanars for a good example.
I Don't believe Magneplanars are true ribbons.
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Old 4th February 2005, 03:49 AM   #8
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Raven 3 not sure what generation of the design

Joules,
The high-end Magnepans use a dipole true ribbon line source tweeter. It uses amazingly thin 2.5 micron aluminum foil to get good efficiency with low cost ferite magnets.
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Old 4th February 2005, 04:01 AM   #9
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DIY ribbon tweeter from hififorum
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Old 4th February 2005, 08:28 AM   #10
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I recall seeing either a transparent, or exploded CAD drawing of the raven tweeter either on e-speakers or the manufacturers...

dave
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