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Old 19th May 2013, 06:37 PM   #771
Legis is offline Legis  Finland
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Quote:
Originally Posted by tinitus View Post
try simulate this one

might have some advantage to use wider magnet, instead of squared.... like 0.5" x 1.5" (magnetised through thickness)
I don't get that model going too well? The Bl drops when the ribbon moves forward, and increases when it moves backwards, not good when designing for low XO and high-ish SPL... Side-to-side Bl-linearity also not as good as with basic model, the sides of the ribbon get considerably more driving force than the center. Correct me if I have simulated wrong.

Also that is not dipolar model, which I would like my ribbons to be. I might make them convertible between cardioid (forward firing) and dipolar with detachable steel-ish back chamber that would also redirect magnetic field. Or then I just damp the rear wave with some resistance/damping material, much simpler and might be more transparent acoustically/sound quality -wise.

Mentioned model with 1.5" x 0.5" (magnetization direction 90 and 270):

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Basic model with 1" x 1":

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Last edited by Legis; 19th May 2013 at 06:40 PM.
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Old 19th May 2013, 06:54 PM   #772
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Legis View Post
I don't get that model going too well? The Bl drops when the ribbon moves forward, and increases when it moves backwards, not good when designing for low XO and high-ish SPL...
ahh...no, ok, I forgot....I dont think a ribbon should move that much

I have done tall man high ribbons in the past
sounded great, but I always found them too uncontrolled at more than low to moderate SPL
and I was missing some power in upper midbass and lower midrange

but the sim shows exactly what I have found too
that the magnet field is flat in a very precise spot, right in front of the magnets

anyway, thanks for doing the sim...much appreciated
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Old 26th June 2013, 12:40 PM   #773
Rewind is offline Rewind  Sweden
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Originally Posted by nikwal View Post
I'm hesitating about the gap between between the magnets.. as you can see in the pictures I'm trying to move them together. Anyway, they seem to work fine.
http://dsl.mine.nu/galleri/misc/band1.jpg
http://dsl.mine.nu/band.jpg
How did you attach the magnets to the U-bar? Did you dare to drill holes in them?
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Old 26th June 2013, 02:46 PM   #774
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They are actually just jammed into the U-bar with possibly some fabric or such.

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Old 26th June 2013, 05:01 PM   #775
Rewind is offline Rewind  Sweden
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I have a Swedish 50cm long ribbon/1" wide ribbon transmission audio true ribbon driver, and I think he glued the nd magnets to aluminum front and backplates. It is open on both sides so they can

Sensitivity is low compared to TPL-150, maybe just 90dB. But sounds much clearer, but not as powerful sound below 3kHz, so I cut it off above that and use it as a supertweeter.

What do you think of this design?
Attached Images
File Type: jpg tpl150 2.jpg (430.7 KB, 102 views)
File Type: jpg 1003814_10151404109706198_201329320_n.jpg (75.0 KB, 105 views)
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