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Ring vs Dome, the great battle
Ring vs Dome, the great battle
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Old 25th May 2018, 09:30 AM   #1
diypass is offline diypass
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Default Ring vs Dome, the great battle

from a long time in my crazy mind there is the question:
- what are the advantages and disadvantages of ring dome tweeters vs dome ?

exactly i'm refering to sbacoustics tweeters:
- ring :
SATORI TW29RN :: SB Acoustics

- dome :
SB Acoustics :: SATORI TW29DN
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Old 25th May 2018, 10:35 AM   #2
fishball79 is offline fishball79  Singapore
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Having lived with Satori beryllium and beryllium compression drivers for a while, all home audio silk domes now sound slightly uncontrolled and has this flappy fabric distortion.

Not with the Satori TW29 and I assume, all other ring radiators. It remain controlled enough for my liking.

So TW29DN and all other high end silk domes will have this distortion I mentioned but most likely will be interpreted as a nice shimmer up top to most.
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Old 25th May 2018, 11:07 AM   #3
TBTL is offline TBTL  Germany
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A dome has more piston area, so it can either be used to a lower frequency or play low frequencies with less distortion.

A ring radiator has its dome fixed at the enter, so it can resonate in less modes. Cone breakup in soft domes starts at several kHz, though the breakup is well damped.

High frequency dispersion can differ, which should be evaluated case by case. This is difficult to predict as without knowledge of the dome, because the dome isn't pistonic at those frequencies any more. (This applies to soft domes only, hard domes are pistonic up to their first breakup slightly above 20 kHz)

Last edited by TBTL; 25th May 2018 at 11:10 AM.
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Old 25th May 2018, 11:21 AM   #4
Juhazi is offline Juhazi  Finland
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Are you guys sure, that this Satori dimple dome is a real ring radiator? Has someone opened it ?


The dimple makes it more rigid than a hemispherical dome and increases pistonic (flat) area. We can see the difference in off-axis responses vs. on-axis. Both show minimal cone resonances, hardly any.
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Old 25th May 2018, 11:26 AM   #5
TBTL is offline TBTL  Germany
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It is being sold and tested as a ring radiator and it has got a dimple, that's all we know. Putting a dimple in a soft dome doesn't make sense, but who knows. Adding a dimple to a dome increases area, but does not increase effective area because motion is not perpendicular to the surface at the dimple.

Last edited by TBTL; 25th May 2018 at 11:30 AM.
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Old 25th May 2018, 12:21 PM   #6
TMM is offline TMM  Australia
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Quote:
Originally Posted by Juhazi View Post
Are you guys sure, that this Satori dimple dome is a real ring radiator? Has someone opened it ?
On the SB29 the dimple is fixed to a solid mounting post in the middle (verified by gently pressing it with my finger ). I assume the TW29 is no different, so yes it is a 'real' ring radiator and not just a dome with an unsupported dimple.
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Old 25th May 2018, 02:07 PM   #7
diypass is offline diypass
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yes i confirm tw29 i a real ring radiator
also confirm that tw29 i more piston motion than other domes, i compared ii vs scan-speak D6600 and the tw29 won on alla parmaters.
compared with scan speak ring radiator (tha have a phase plud), the tw29 has real better performance
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Old 25th May 2018, 02:54 PM   #8
eriksquires is offline eriksquires  United States
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You know, it may be worth to examine the closely related XT25 and DA25 series from Peerless.



The XT25 has a narrower dispersion, which for me often works best. I use it in a HT for center and surround duties, with the mains using big AMTs. They do not get embarrassed. I have no experience with their dome counterparts though.


As I read, the ring radiator was originally done as a joke. A designer stuck a thumb tack in the middle of the dome and it actually sounded better. Looking at the XT25 for an example, it has very flat extension way past 20 kHz without any oil-can resonance. So that alone is a very good reason to consider this relatively inexpensive driver, or the Scanspeak equivalent.
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Old 25th May 2018, 05:36 PM   #9
HorvathS is offline HorvathS  Hungary
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Hello,

I have 29RDC, 21RDC and I heard 19XT and 25XT.
The crossover for 21RDC will be ready in the next week, but it is a dissappointment in the first hearing
The distorsion below 3k is high.

The XT's were narrow transmission.

29RDC is good, but there are better tweeters it the market - of course for higher price.

-------------
PS: we measured both 29RDC and Satori in the Hungarian forum, the difference is minimal. The aluminium faceplate don't worth the 2,5* price.

Last edited by HorvathS; 25th May 2018 at 05:41 PM.
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Old 25th May 2018, 05:57 PM   #10
eriksquires is offline eriksquires  United States
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Horvath,


You are not wrong about the XT25 narrow dispersion. On the other hand, on my desktop, that's perfect.



What's interesting is that in high-end speakers like YG, Krell,and others, they often use them with a waveguide.
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