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Old 29th August 2014, 05:53 AM   #1
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Default Cone tweeters

I am interested in the current situation wherein the vast majority of hi-fi tweeters have dome diaphragms. Of course, there are ribbon and ring diaphragms too, but the overall market share is quite low. The reason for my interest is that the dome, especially the fairly shallow ones commonly seen, is not as geometrically "stiff" as a cone, given the same overall height. At least, intuitively that is how it seems to me; the near-flat region at the peak of the dome has little stiffness on its own, whereas a cone or inverted cone should be significantly stiffer and therefore capable of playing up higher in frequency while remaining pistonic.

Thoughts? Is this a manufacturing issue or one of tradition?
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Old 29th August 2014, 07:41 AM   #2
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... i am not shure concerning "stiffness" being "lesser" in a dome.

There are some inverted dome teeters having a voice coil diameter smaller than the dome itself:

http://vintage-audio-laser.com/photo...v/t120k-01.jpg

The "traditional shape" in making a tweeter is - in fact - the cone tweeter:

http://www.conrad.com/medias/global/...B.EPS_1000.jpg


But there are also modern versions, this one is from Davis:
http://www.parts-express.com/Data/De...7-350_HR_0.jpg

There has been a review of this tweeter in "Klang + Ton, Heft 3/2012 (April/Mai)"
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Last edited by LineArray; 29th August 2014 at 07:49 AM.
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Old 29th August 2014, 12:53 PM   #3
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Quote:
Originally Posted by LineArray View Post
There are some inverted dome teeters having a voice coil diameter smaller than the dome itself:

http://vintage-audio-laser.com/photo...v/t120k-01.jpg
...
Good point, I think that was one of the reasons for Focal and others.
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Old 29th August 2014, 12:58 PM   #4
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The JBL LE26 tweeters and others vintages @troelsgravesen.dk loudspeakers.
JBL LE26 tweeter-
Vintage HiFi
JBL L26 restoration and upgrade
JBL L100 Century
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Old 29th August 2014, 01:05 PM   #5
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The 2" Visaton TW 6 NG - 8 Ohm is used in a variety of simple setups speakers like the Visaton NoBox 170 or the Klang+Ton Cheap Trick CT 230 (retro speaker).
TW 6 NG - 8 Ohm
NoBox 170
https://www.lautsprechershop.de/inde...i/ct230_en.htm
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Old 29th August 2014, 04:54 PM   #6
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Quote:
Originally Posted by LineArray View Post
... i am not shure concerning "stiffness" being "lesser" in a dome.

There are some inverted dome teeters having a voice coil diameter smaller than the dome itself:
Crudely speaking, if you put your finger on the tip of a dome, it is obviously rather easy to deflect (and dent, in the case of a metal dome). However, if that dome were coming to a peak, as if it were almost like an inverted cone with a rounded tip, would it not be much more resistant to deflection?

Yes, reducing the amount of cantilevered material does seem to be a good approach to increase the overall stiffness. Focal's driver designers have historically appeared to be quite competent, though I can't quite say the same for their cabinet people.
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Old 29th August 2014, 05:18 PM   #7
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Peerless used to have (no longer in production) an excellent little cone tweeter,
the CT62-H. PP cone with ferrofluid, useable from 3.5-4 kHz. In my memories their sound was better than most run-on-the- mill soft domes. With some luck you might be able to get some NOS stock if you look hard enough.
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File Type: jpg peerless_conetweeters.jpg (65.2 KB, 282 views)

Last edited by dragonweed; 29th August 2014 at 05:21 PM.
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Old 29th August 2014, 07:32 PM   #8
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Originally Posted by dragonweed View Post
Peerless used to have (no longer in production) an excellent little cone tweeter,
the CT62-H. PP cone with ferrofluid, useable from 3.5-4 kHz. In my memories their sound was better than most run-on-the- mill soft domes. With some luck you might be able to get some NOS stock if you look hard enough.
Unfortunately the size of cone tweeters is typically larger than for domes, and off-axis response suffers as a result.

I would love to see a 1" cone tweeter built with a contemporary motor.
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Old 29th August 2014, 07:38 PM   #9
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Bottom of page 4:

http://resources.prismsound.com/tm/L..._ALMA_2003.pdf

Quote:
The 3D plot in Fig. 7 of the mode at 1700 Hz reveals that the outer edge of the cone + surround is breaking up and moving out of phase with the main part of the cone above 1700 Hz. This behaviour is causing the well-known “Edge hole” due to lack of geometrical stiffness along the flat cone edge.
A flat cone edge is not completely different than the flat peak of a dome.

Also see page 7 here:

http://www.loudsoft.com/artikler/1%2...OICECOIL_2.pdf

Last edited by 454Casull; 29th August 2014 at 08:04 PM.
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Old 30th August 2014, 01:54 AM   #10
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Originally Posted by 454Casull View Post
I would love to see a 1" cone tweeter built with a contemporary motor.
Wouldn't that have an awfully small coil, leading to limited power handling?

If you enlarge the coil to the size of the outside of the diaphragm you're back to a dome. I don't see a way around that.

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