Do diamond domes sound different than beryllium domes? - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 38 Old 02-09-2013, 11:25 AM
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Originally Posted by inky blacks View Post

Are hard domes even the preferred way to go?
It's a matter of stiffness and light weight. Silk is obviously light, but it will only take so much power before it lacks adequate stiffness. That's why you see mostly metal diaphragms in pro-sound compression drivers.

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post #32 of 38 Old 02-09-2013, 01:09 PM
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It's about being able to charge $600 more per speaker for diamond dome tweeters, isn't it?
Yep. And if you look at how they're made the diamonds are literally a dust coating. There are better ways to make domes out of carbon, it's just a matter of time before they appear.

Pioneer has done drivers on and off in something they call "ceramic graphite" (see this 1980s speaker and this current model.

According to the Stereophile review of the older one, it's kind of brittle stuff.

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post #33 of 38 Old 02-09-2013, 01:21 PM
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My center channel (DIY) uses the ScanSpeak Aircirc fabric dome. A wonderful tweeter especially for vocals. There is a new "Aircirc" Beryllium dome from ScanSpeak that has a smoother frequency response. Hard to justify $520 for a tweeter whose cheaper sisters have smoother response though.
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post #34 of 38 Old 02-09-2013, 01:34 PM
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Yep. And if you look at how they're made the diamonds are literally a dust coating. There are better ways to make domes out of carbon, it's just a matter of time before they appear.

Waiting for the six thousand dollar graphene dome tweeter?

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post #35 of 38 Old 02-09-2013, 01:45 PM
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Waiting for the six thousand dollar graphene dome tweeter?
Since there are people stupid enough to spend $200k on a speaker I have no doubt that $6k tweeters will be along at some point.

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post #36 of 38 Old 02-09-2013, 02:23 PM
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Originally Posted by inky blacks View Post

Are hard domes even the preferred way to go?

Look at these two tweeters.

SILK DOME

http://www.parts-express.com/pe/showdetl.cfm?partnumber=275-070

RING RADIATOR

http://www.parts-express.com/pe/showdetl.cfm?partnumber=264-1016

Polk is making cheap tweeters out of silk and plastic, which I have not heard yet, but which sounds like a great idea to me. They should last a long time,…longer than silk alone or fabric alone.

I think that the difference between a good soft dome and a good hard dome is greatly exaggerated these days. Resonances of hard domes have been moved into the inaudible range above 20kHz while some soft domes have smooth response to above 30kHz.
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post #37 of 38 Old 02-09-2013, 07:48 PM - Thread Starter
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Moissanite /ˈmɔɪsənaɪt/[4] originally referred to a rare mineral discovered by Henri Moissan having a chemical formula SiC and various crystalline polymorphs. Earlier, this material had been synthesized in the laboratory and named silicon carbide (SiC).

http://en.wikipedia.org/wiki/Moissanite

Moissanite would be cheaper than diamond and would probably work in a tweeter.

Cubic zirconia for tweeter use?
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post #38 of 38 Old 05-17-2014, 10:21 PM
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It appears that someone is selling a 2"x 4" Single Layer Graphene Sheet on Copper Foil on ebay for $850.

http://www.ebay.com/itm/Single-Layer-Graphene-Sheet-on-Copper-Foil-/201088327221

 

I wonder how this will sound if this is shaped into a dome (with voice coil and rubber surround added of course) and dropped into an existing tweeter. Should be enough to make 2 good ones or possibly 4 if the driver is small enough.

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