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Old 17th October 2004, 12:18 AM   #11
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http://www.transmissionaudio.com/ima...ve_Web_kHz.jpg

This looks hard to believe.

http://www.transmissionaudio.com/ima...se_Web_168.JPG

(censored)
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Old 17th October 2004, 01:35 AM   #12
SY is offline SY  United States
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454, I had to manually edit out your attempt to get around the obscenity filter. That's extra work for me (unpaid work!) and gets me cranky. Please don't do that again.
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Old 17th October 2004, 03:08 AM   #13
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Sorry.
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Old 17th October 2004, 03:25 AM   #14
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So, after reading through the pattent application, im still a bit confused... What is actually different about these ribbons? It probably has more to do with my lack of understanding in how normal ribbons work.
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Old 17th October 2004, 11:15 AM   #15
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Chris8sirhC - You're not alone wondering. I'm no ribbon expert either, but it sure sounds like he claims the prior art. There is something about an opening behind the ribbbon that may be novel, but it sure doesn't sound like the strongest patent application.

Then again, B*se seems to be able to patent the prior art pretty regularly.
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Old 17th October 2004, 04:31 PM   #16
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Ive seen a dipole ribbon before, so its not like that is anything new. The only other thing i can really gather is that on one of the designs the pole piece is inbetween the magnets and the ribbon (....I think???) and he doesnt have to use a transformer to drive it.

www.audiodesignguide.com/mag/index.html
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Old 17th October 2004, 04:59 PM   #17
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Interesting, I am a little baffled about how it is possible to achieve
a decent ribbon transducer with a ribbon width of 8cm without resorting to huge magnets or some planar arrangement?

My own limited ribbon transducer experience is designing a transducer for headphone use.
As for theirs being the first ribbon headphones ,I believe someone designed a pair in the 1930s and I had my first pair up and running in 2001.


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Old 18th October 2004, 04:50 PM   #18
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Default Patent looks like Series Xover for Ribbons

The patent by TransmissionAudio that SY referenced appears to be an attempt to patent a series crossover for ribbons that is in common use for dynamic speakers.

Ribbons have a very low impedance, often < 1 ohm, and a step-up transformer is typically used to create a higher impedance between 4-8 ohms that most amplifiers can drive. This transformer inserts phase, step response, and frequency limitations. A good transformer is expensive.

By putting the midrange and tweeter ribbons in series, along with series passive components for crossover and equalization, one can create a higher impedance, more amplifier friendly load. This removes the cost and performance limitations of transformers, and allows one amplifier to drive multiple ribbons with greater fidelity and lower cost.

For long, wide bandwidth ribbons, I have found that a low impedance direct drive amplifier is required to mechanically control the ribbon's movement in the magnetic field. I have built Class-A amplifiers that sound very good driving a 0.5 - 1 ohm resistive load, which thanks to low 7V output power supplies, are modest in cost, heat and size.

Nelson Pass as part of his First Watt efforts has published a few articles on current source amplifiers and series crossovers that cover the same ideas as in this patent. Nelson has also discussed using a current source amp to drive (tweeter?) ribbons.

http://www.passlabs.com/np/CurrentSo...erNetworks.pdf
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Old 18th October 2004, 07:52 PM   #19
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Another new ribbon is made by BEEngineering and is featured
on www.E-Speakers.com down to 300hz! but do be seated
when you read the price.


Woody
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Old 18th October 2004, 08:55 PM   #20
BobM is offline BobM  United States
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These are the guys who made the ribbons for Mark Levinson's Red Rose speaker systems. In fact, if I read it correctly, they designed the entire Red Rose speaker line, not just a supplier of the parts.

Those speakers (especially the little one's) got a lot of nice reviews. So the new ribbons are better. Where's the project that proves that? And what's the cost?

Enjoy,
Bob
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