my 14 inch full range speaker!

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#102
Well, I always say that nothing is worth living with unless its customized 😉

I'm not sure customizing on a per person basis at the driver level would be anything short of insanity, but it would certainly be the sort I could admire, encourage and covet 😉

I'm also totally willing to conduct long term testing on some of those 14" drivers . . . please keep showing us your stuff as you crreate it so we can live vicariously 😉

Kensai
 
#103
just talking

I want to talk about the 14 inches full range loudspeaker. First, let me introduce myself. I'm also from China, Author and I live in the same city, Suzhou(most beautiful city in China). I am a lucky dog, I have ever heard the speaker, it's very very impressive. Before listening, you can't imange that the huge cone could emanate so good high frequency reponce. This point are proved by the test chart. The sound feels very true. It's a pity,My English is not well too(but it's improving). I don't konow how to express the other feeling in English. In a word, it sounds wonderful. Oh,It's too late. I have to go to bed. Next time, I will talk about author's DIY earphone(made by simple things but could defeat famous brand), You may ask me: Am I serious? I will tell you, Yea I'm serious.
 
#104
Chinese,

That size will be very good. Will you also make one using your paper slurry, with fibers in binder glue and show it to us?

For a small, limited frequency cone with very small energy, a firm cone will be best. Not like diamond, not like titanium like stiff paper. If the glued seam cone will not be stiff, like fiber slurry and glue cone, then it will not function properly, with EnABL pattern, for high frequencies only.

What are the fibers in the paper of the glued seam cone please? Do you know what binding glue has been used? Can you tell us what stiffening material you will use and not give away your secrets?

Bud
 
#105
Janneman,

I agree, we have not discussed Walsh's theory. I suspect that those who understand it think it pretty obviously correct and those who do not are either afraid of looking foolish and asking about it, have the more conservative view of driver physics that is so profoundly overturned by Mr. Walsh, or are not aware there is a difference of opinion. Please read this latest post from me, I invite you to join in the thread and add information in a post there, please.
http://www.diyaudio.com/forums/showthread.php?s=&postid=1174321#post1174321

Bud
 
#106
Bud, so what exactly do you think would make such a difference with this 14" up side down as a Walsh, other than being omni directional instead of dipole
I actually thought of it myself, but actually dont see the point of it
loading this big feathery membrane into an enclosure might even kill it completely

If this really works that good, mr. Chinese has develloped something very unique - dont tell him how to do his thing, respect it as it is

It reminds of one of those rare gems to reach the absolute cult status, but will also remain like that

But a cone tweeter could have some commercial succes
:clown:
 
#108
tinitus,

I do not want Chinese to change his designs or process. I am in fact attempting to learn what he feels comfortable about describing about his process. I do not want him to use the large cone as a Walsh style driver, regardless of it being extremely close in dimension ratios to a true Walsh bending board device.

I provided him with a general conic section, with EnABL pattern, sized to that driver because those were the dimensions he provided.

Most of what he and I are replying to is poorly translated, idiomatic language usage, not well handled with translation programs

That his large cone would benefit is very, very, likely. All drivers suffer from boundary layer corruption, induced by sudden termination.

He may well have the perfect damping material mixed with his binder and be able to provide a complete lack of reflected waves at cone end. I have repeatedly said I do not want him to divulge this information, though I would love to know.

If he has indeed found the perfect emitter material, then, the EnABL process will have zero effect and I will have had no effect upon "his own thing". If he is very close to perfection then the EnABL process will get him even closer and hopefully aid him in his determination to out do other full range, single driver fabricators.

I think highly enough of his artisan ship, and his art work, to offer the information freely, to use or not. I am truly sorry if I have offended your sensibilities in any way, but I am still willing to help as I can, in Chinese's rather special events. And, still intend to learn what he is willing to teach.

Bud
 
#109
Bud, I completely understand your enthusiasme and actually feel the same way, seeing all that would be possible

But sometimes we have to let go, and let things take their own course

With a small cheap driver you can easily make your own Walsh driver - remove membrane and mount a the new one with a smaller foam surround in the modified chassis, and voila you have your driver - but I guess you know that

Chinese, you and your friends seem very serious and experienced - do you have any particular plans with your drivers, or just having fun

🙂
 
#113
janneman said:



Hi Chinese,

Are you aware that this speaker is completely different from traditional cone speakers? With this speaker, the object is not to try to make the cone pistonic. The principle is to have bending waves travel from voice coil to rim, and while doing it radiate sound. So, in this case the material and its bending modulus are the important characteristics, not weight and stiffness.

The principle is similar to teh Wash concept. Most people are not aware that the Wash (and DDD) principle is completely different from traditional cone principles; there is a whole thread on Wash rebuilt somewhere here where that issue is ignored or unknown.

Jan Didden
Click to expand...


good explaination! Have you ever heard the sound of Walsh speaker?What does it like? I'm interested in it now.
 
#114
Hello,

I ´ve heard both.

The big Walsh, Bass of a closed box, mids and soundstage
good but highs were not so good, here the membranmass
large- and thickness is not fine.

The DDD is much better, thanks to Mr Dicks wave theory,
but the DDD (german physiks) has an extraordinary
dipol frequence at 6 kHz (8 dB peak) so you must
use a notch filter.

As i´ve heard there is a new DDD driver made, without these
problems. and a new horn smaller as the lure is in progress.

Don´t forget the Manger, in the new POSAUNE horn, you will get nearly an omnidirectional character with two MSW.
 
#116
Hello Alchemier,

AER Mr. Keller makes his cones like this,
he might have a patent about this trick.

Try it, I think the first cone step need a change to
close the 3 kHz hole, the measurement shows me
the driver has a high Qts and a lot of K2 and K3 below 2 kHz,
this may be effects the lost around 3 kHz,
it is not dramatically listenable.
 
#118
ironical ?

for a conical membran as an bending wave transductor,
you need to know the sound speed in the material,
than you must form the membran that the sound
release in correct time and look on the dipol frequence.

If you make it like a horn the bending wave is very difficult,
you get a stiffer membran and less bending waves??
 
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