there is US patent application...
I would be surprised if the rear of the ribbon supports do not effectively turn the ribbon into sections at some high frequency - this then may in essence resolve back to an approximation that is the same as multiple smaller ribbons angled in the vertical plane, which of course has issues at high frequencies.
Still, it may sound ok...
_-_-bear
I would be surprised if the rear of the ribbon supports do not effectively turn the ribbon into sections at some high frequency - this then may in essence resolve back to an approximation that is the same as multiple smaller ribbons angled in the vertical plane, which of course has issues at high frequencies.
Still, it may sound ok...
_-_-bear
I've been looking at the drawings in the patent application and I think it´s doable DIY wise, at least as an experiment.
Has anyone tested it and like to share the results?
I have now a 128 cm by 26 mm corrugated ribbon (that would be 50'' by 1'') and as I get the charateristic 5-6 dB raise from 3 kHz to 13 kHz bending the ribbon the Fibonacci way might lower that level. Also bending the ribbon horizontally have come across my mind.
Any thoughts?
Has anyone tested it and like to share the results?
I have now a 128 cm by 26 mm corrugated ribbon (that would be 50'' by 1'') and as I get the charateristic 5-6 dB raise from 3 kHz to 13 kHz bending the ribbon the Fibonacci way might lower that level. Also bending the ribbon horizontally have come across my mind.
Any thoughts?
Yesterday plots of the Fibonacci ribbons were posted at Fibonacci Technologies Two Channel Loudspeakers
-david BTW
-david BTW
I've heard the Fibonacci ribbons and I thought they sounded wonderful. Having said that, George ought to hire a designer to integrate them into a package that looks less "home-made". Physical appearance goes a long way when selling audio products, so why not have a speaker that sounds great and looks really high end, too?
John
John
That's a good question that the text doesn't exactly answer.
The roll off in response below 80Hz and the accompanying rise in impedance is attributed to a protection circuit. The roll off slope appears to be -12dB/octave. So, this could be a 2nd order HP filter described as protecting the ribbon from over excursion and heat.
Also, most directly driven ribbons have a nearly constant resistive impedance. The peak of 14 ohm in the midrange(1.1kHz) makes me think that there is a notch filter involved to suppress a roughly 10dB peak in the native response of the ribbon, or ribbon + enclosure.
However, elsewhere on the website claims of "no crossover" are made, so...
Very homey, I'll admit.
Looks like he could use the aid of an Industrial Designer or Architect (I'm available) to add a little more grace to somewhat DIY looking products.
I'm sure most here will judge his speakers by what they hear in person and not what by what they see in photos or see in person.
Still, looks account for something in the world of Hi-End. The more you spend the better it is expected to look.
ONE of the (at least 3 that I know of) patents applied for regarding using a "bent" ribbon is not for "bending" the ribbon, but for the suspension method of bending the ribbon so it does not interfere with the frequency response.
George is definitely NOT "fly by night". I've known him for over 20 years ( I own Serial #'s 007 and 008 of North Creek Music Systems speakers) Yes, he operates out of a small shop, but in the real world, that means more attention to detail and higher quality. Perhaps you could find some world class "hi-fi" down at the nearest Best Buy.
North Creek has been around for quite a few years...
As far as bending a ribbon, it implies supports of some sort, since thin aluminum foil won't hold its shape on its own.
So I am wondering how he is doing this and what sort of efficiency/sensitivity it has... a freq response graph would be nice too, eh?
_-_-bear
That is what one of his patents is about....the suspension method.
Ok...I've replied to a few posts here from people who are ignorant. Ignorance is not intended as an insult, just in it's proper context of "not knowing"
I've known George for over 20 years, and consider myself lucky to count him among my best friends. I have firsthand knowledge of his expertise, methodology, and the quality of his products. I literally watched him conduct his research which earned him a Master's Degree in Physics.
George is one of the most honest, forthright, and technically proficient people I know. I have never heard him inflate a claim, and anyone who has purchased or assembled his loudspeakers (if they adhere to guidelines) will attest to the measurable accuracy of his responses and the sound quality of his products. I can assure you that if he says his 12 ga. coils are better than an 18 ga. coil, it's because he has measured the inductance and found the 12 ga. to be a better design element. If he says his capacitors are "special" it's because he found them to work better in his products than a competitors. Think about it....it really would serve no purpose to fabricate something like that.
Bottom line is, the guy is the real deal. He may try to sell a little sizzle when you're shopping for a steak, but he should, after all. Just don't doubt his integrity.
I've known George for over 20 years, and consider myself lucky to count him among my best friends. I have firsthand knowledge of his expertise, methodology, and the quality of his products. I literally watched him conduct his research which earned him a Master's Degree in Physics.
George is one of the most honest, forthright, and technically proficient people I know. I have never heard him inflate a claim, and anyone who has purchased or assembled his loudspeakers (if they adhere to guidelines) will attest to the measurable accuracy of his responses and the sound quality of his products. I can assure you that if he says his 12 ga. coils are better than an 18 ga. coil, it's because he has measured the inductance and found the 12 ga. to be a better design element. If he says his capacitors are "special" it's because he found them to work better in his products than a competitors. Think about it....it really would serve no purpose to fabricate something like that.
Bottom line is, the guy is the real deal. He may try to sell a little sizzle when you're shopping for a steak, but he should, after all. Just don't doubt his integrity.
I did not claim it was patented.I have seen a bent ribbon in a danish mag
hmm 10 years ago
I consider myself lucky to have heard these speakers last summer at Audiofest in Md.
I talked briefly with George as her was setting things up and what I heard was very good. I have been enjoying my Maggy 3's for a year now and I am use to very open sound.
Its obvious that his speakers are hand build in a small shop, but to me thats a good thing. He is a speaker manufacturer not a furniture man.
I am hoping he will come back to Audiofest this summer
I talked briefly with George as her was setting things up and what I heard was very good. I have been enjoying my Maggy 3's for a year now and I am use to very open sound.
Its obvious that his speakers are hand build in a small shop, but to me thats a good thing. He is a speaker manufacturer not a furniture man.
I am hoping he will come back to Audiofest this summer
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