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Hi,
surfing on youtube i have found an amazing video (see link)
This is a reasonably good old speaker
But is this an acceptable behavior ?
But all the plastic cones behave like this one ?
What do you think ?
Thanks a lot.
Kind regards,
bg
Follow Ups:
You don't have to be Einstein to understand that. Besides, there are plenty of other videos of the same speakers that act as they should.
Hi and thnk you All for the very interesting explanations and advice
I understand now that is a trick of the camera and not a real effect
Clearly a behaviour like this would be unacceptable for a cone
Thanks a lot again.
Kind regards,
bg
ALL drivers ring including paper. The question is where(high enough to be above crossover is good) and how badly(intensity and then how well damped so the ringing doesn't last as long. Metal holds off ringing higher but it breaks up worse when it lets go.
Bextrene, the 1st major use of plastic drivers rings very badly. That's the reason for the shiny finish. It's PVA, a coating to dampen the ringing to reduce its affects.
Besides plastic, I am interested in other materials for speaker driver(s). Such as carbon fibre, flax (Focal/JM lab) and kevlar.
Having actually tried / used many of those materials - I can say that the best (most like music) cone material is simple paper!
charles
I like hemp, as found in some AN(UK) woofers.
Cheers,
Al
Or better not science at all. What you see is the effect of the digital camera operation that scans from top to bottom in finite. When reproduced, top and bottom are shown simultaneously, therefore appearing to have non uniform motion. Btw, recorded motion has nothing to do with breakup modes.
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"One must be sane to think clearly, but one can think deeply and be quite insane."
It's a very fascinating effect.
I've seen many videos of "cone motion" with audio sweeps and I've never once seen this kind of distortion before.
I wonder why this effect would not be more common...
Cheers,
Presto
n/t
.
Waves dont travel up the cone like that. Just like when you film wheels on a car. They look like they're going backwards or standing still.
That doesn't look right. Seems to be an asymmetrical component to the mechanical stiffness of the driver which comes out at specific frequencies and harmonics thereof.
Something is amiss.
Cheers,
Presto
Besides Thiel loudspeakers, I would be interested in other companies that use metal drivers?
I have Harbeth P3ESR's that use a metal tweeter and they sound just fine!
Where have you been? Bozak,NEAR, Monitor,and many others.
Metal tweeters have long been used by pretty much everyone. And just check out automotive suppliers.....
Hi and me too
But i now wonder if this behavior is typical of all plastic cones
This woofer must distort the sound. It cannot be hifi, i think.
Paper cones for instance do not warp like this.
I understand that plastic is cheap ... but there is a limit.
Very impressive.
Kind regards,
bg
Pistonic motion from any driver is the ultimate goal of all driver desgn. Paper, plastic,metal : all have issues as the material must also be as light (low mass) as possible. We see super light and stiff materials being used: titanium, beryllium, carbon fiber,even diamond.i
Hi and if i understand rightly the only way to achieve pistoni motion is with a rigid membrane
If i think about plastics i cannot see the "stiffness"
I would go with metal cones with some kind of treatment to tame the ringing instead ... just an idea of course.
Kind regards,
bg
Plastics cover a wide range of materials. Some can be very stiff. Current trends for woofers seem to comprise multilayer laminates though. Focal with CF/kevlar/ nomex cone.Vandersteen with CF sandwich around balsa core.....The Vandys are interesting. Claims the cone is almost 6 mm thick where it meets voice coil since that is where cones distort the most.
FWIW
Edits: 07/31/14
Hi and thanks very interesting indeed
Of course there is plastic and plastic
Also fiberglass is used by Scanspeak and others i think
Balsa in an interesting new entry for materials ... i have found an example of use
Thanks again.
Kind regards,
bg
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