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Old 19th October 2004, 04:08 AM   #21
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I haven't read the whole patent application. However, it appears that the really novel thing about these ribbons is the end attachment. It's some sort of floating thing where the ribbon moves as a straight line rather than the typical bowing movement where the ends are fixed and the middle moves more than the rest. That gives you more real Xmax with less distortion. The other bit is using a resistor to increase the impedance the amp sees, rather than a transformer, but that seems less important than the construction of the ribbon.
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Old 19th October 2004, 04:12 AM   #22
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If I'm not mistaken, the Red Rose speakers use Aurum Cantus ribbons.
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Old 19th October 2004, 12:59 PM   #23
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Quote:
Originally posted by catapult
I haven't read the whole patent application. However, it appears that the really novel thing about these ribbons is the end attachment. It's some sort of floating thing where the ribbon moves as a straight line rather than the typical bowing movement where the ends are fixed and the middle moves more than the rest. That gives you more real Xmax with less distortion.
That's what they call the Uniforce drive, not their Dynamic/Ultra Propulsion drive.
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Old 19th October 2004, 02:09 PM   #24
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Quote:
Originally posted by catapult
I haven't read the whole patent application. However, it appears that the really novel thing about these ribbons is the end attachment. It's some sort of floating thing where the ribbon moves as a straight line rather than the typical bowing movement where the ends are fixed and the middle moves more than the rest. That gives you more real Xmax with less distortion. The other bit is using a resistor to increase the impedance the amp sees, rather than a transformer, but that seems less important than the construction of the ribbon.
Wow - I haven't read the patent at all, but this is exactly what I guessed just from browsing the site - it's the only way they could conceivably get their claimed 1" excursion from a ribbon. Pretty good idea - put a linear voice coil of some sort on the ends of the ribbon and drive it in conjunction with the usual ribbon setup. I don't think true ribbons typically require much in the way of tension, but it's probably still a bit tricky to design the end mounting points.
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Old 19th October 2004, 07:40 PM   #25
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Quote:
Originally posted by catapult
If I'm not mistaken, the Red Rose speakers use Aurum Cantus ribbons.
You are mistaken...

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Old 20th October 2004, 08:42 AM   #26
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Was just wondering...

They comment on time consuming nature of that linear drive thingy... how about this... Notice big loops at end, that does not (almost) sit in Magnetic field... they might move only on command of middle section of ribbon... you would have to tweak severely to get thickness and flexibility of end bits to make sure you get no sag, no reflection... and still excursion...

Has anybody tried this... Don't know if you can temper anneal or in anyway heat treat aluminium though...

Would conventiallish vc be able to move as fast as ribbon?

Dunno
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Old 20th October 2004, 12:07 PM   #27
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Quote:
Originally posted by agrobler
Was just wondering...

They comment on time consuming nature of that linear drive thingy... how about this... Notice big loops at end, that does not (almost) sit in Magnetic field... they might move only on command of middle section of ribbon... you would have to tweak severely to get thickness and flexibility of end bits to make sure you get no sag, no reflection... and still excursion...

Has anybody tried this... Don't know if you can temper anneal or in anyway heat treat aluminium though...

Would conventiallish vc be able to move as fast as ribbon?

Dunno

It would seem to be quite a task to get a ribbon to move in an
entirely 'pistonic' fashion.
The moment one tethers the ends it will bow too and fro to some degree.
I suppose if the ribbon behaved as if it was effectively stiffer in the middle one could counteract the effect.
I guess how much this actually matters depends on how much excursion one requires.


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Old 20th October 2004, 02:02 PM   #28
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Default Mmmm...

Just noticed that they mentioned that only their 4m long ribbons truly approach line source... So maybe their linear drive is not quite what it seems... could be that they mean it is practically speaking a proper line source - But in the context they used it...

Anyway some people just make sure the folding of the ribbon is fairly large, so reducing whatever tension there may be as excursion increases... Would increase sagging...

So how do they build an unsupported ribbon of 4 meters without sagging? Even with only very slight bending... Maybe they just invert ribbon fairly often
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Old 20th October 2004, 03:30 PM   #29
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Maby those magnets you see above and below the ribbon sorta keep it tentioned by pulling it horozontally?
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Old 20th October 2004, 03:45 PM   #30
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Maybe...... Should use iron / steel ribbons... would work a whole lot better then
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