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Old 7th February 2005, 09:02 PM   #1
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Lightbulb OGIaudio - True Ribbon - Full Range

Hello,

I'm Tomislav from Croatia / Europe

Please see my DIY : True Ribbon - Full Range - One Way System

www.ogi-audio.com

I will appreciate your opinion.

Click the image to open in full size.
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Old 7th February 2005, 09:12 PM   #2
dhenryp is offline dhenryp  United States
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They look great! Can you share any more details (without giving away trade secrets):

1. How wide is ribbon?
2. How thin is ribbon?
3. Neodymium magnets?
4. Field strength?
5. Is it one ribbon or is it segmented to prevent excessive motion caused by base frequencies (e.g. from subwoofer)?
6. Direct drive or do you have a transformer?
7. When did you build them?
8. Efficiency? Your charts seem to imply 90db (per watt?)
9. Power handling/ Max SPL?
10. Are these a commercial product? (Price?)

Once again - they are very impressive!
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Old 8th February 2005, 04:16 AM   #3
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The table below shows the cm^3 volume displacement required to produce a 110 db SPL at various frequencies for a monopole and dipole with 20" wide baffle. No single ribbon described in the literature can mechanically achieve this, or keep Doppler IM distortion under control over even a fraction of this range. A 2-way linesource seems like the minimal full range option for <110 db SPLs @1m, 85db at listener. A 3-way line source seems like the minimal full range option that can deliver >110 db SPLs @1m with a few % Doppler distortion.


SPL = 110 @ 1m
Effective path difference D =508

Vp = Sd Xmax
Freq....monopole...dipole
Hz......cm^3......cm^3
20......5997....34,418.29
28......2999....12,168.70
40......1499....4,302.29
57......750.....1,521.09
80......375.....537.79
113......187....190.14
160......94.....67.22
226......46.9...23.77
320......23.4...8.40
453......11.7...5.86
640......5.9....2.93
905......2.9....1.46
1280.....1.5....0.73
1810.....0.7....0.37
2560.....0.4....0.18
3620.....0.2....0.09
5120....0.0915...0.0458
7241....0.0458...0.0229
10240...0.0229...0.0114
14482...0.0114...0.0057
20480...0.0057...0.0029
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Old 8th February 2005, 08:12 AM   #4
jdybnis is offline jdybnis  United States
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According to Dan Wiggins of Adire Audio doppler distortion isn't significant even at levels of 25% - 50%. (Don't have the a link handy. It might have been on this site or another).
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Old 8th February 2005, 12:16 PM   #5
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Thanks!

1. How wide is ribbon?
17mm

2. How thin is ribbon?
0,005mm

3. Neodymium magnets?
yes

4. Field strength?
I didn't measure

5. Is it one ribbon or is it segmented to prevent excessive motion caused by base frequencies (e.g. from subwoofer)?
One 2m ribbon

6. Direct drive or do you have a transformer?
Direct drive

7. When did you build them?
Before 5-6 years

8. Efficiency? Your charts seem to imply 90db (per watt?)
I didn't calibrate my measuring system so I don't know.
The amplifier on the photo is my work too, A-class 2x6W RMS with 400W input, and it is loud enough.

9. Power handling/ Max SPL?
For a ribbon speakers is fanny to talk about that.
It can play loud more than I need, quality and emotions that I get are main things for me.

10. Are these a commercial product? (Price?)
I plan to offer this speakers in the future, I have more ideas for improvements so first that.

11. Doppler distortion?
Doppler effect is something that I want, people don't understand this very important thing.
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Old 8th February 2005, 04:54 PM   #6
dhenryp is offline dhenryp  United States
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Hi Tomislav,

Is the ribbon corrugated? I can't see any folds in the close up picture but it may just be the picture resolution. Do you have any construction photographs or any close up photos of the ribbon/magnets/pole pieces?

Thanks.

Denis
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Old 8th February 2005, 08:10 PM   #7
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Is the ribbon corrugated?
No

Do you have any construction photographs or any close up photos of the ribbon/magnets/pole pieces?

Yes but I can't show you now, sorry.
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Old 9th February 2005, 06:42 AM   #8
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What is it about the Doppler effect that you find advantageous in a sound reproduction system?
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Old 9th February 2005, 10:43 AM   #9
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What is it about the Doppler effect that you find advantageous in a sound reproduction system?

Doppler effect is natural thing, please stop thinking about it.
Think on this way: one mic. membrane - one speaker membrane
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Old 9th February 2005, 11:24 AM   #10
Keld is offline Keld  Sweden
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Quote:
Originally posted by OGIaudio
SNIP
Doppler effect is natural thing, please stop thinking about it.
Think on this way: one mic. membrane - one speaker membrane
This is where true phase come in

What is the resistance/impedance of the ribbon??

Nice looking speakers BTW!
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