New 1.5" Beryllium CD from 18Sound - diyAudio
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Old 26th September 2012, 10:45 AM   #1
SunRa is offline SunRa  Romania
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Default New 1.5" Beryllium CD from 18Sound

Wow, have you guys seen this: ND4015BE - HF Neodymium Driver ?

4" Be diaphragm! I have the strong feeling that when that day when I'll build my speakers, I'll use 18Sound drivers.

Click the image to open in full size.

It would need some Eq, that's for sure, but 600Hz to 20Khz seems now possible. Is it me or I see some resonances in the impedance curve?

Click the image to open in full size.
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Old 26th September 2012, 11:12 AM   #2
SunRa is offline SunRa  Romania
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Oh my.. I've seen the price. My hopes are ruined..

1,650 EUR each.. I really thought a production model Be driver would be cheaper than modifying a CD with Truextent diaphragm.. Man..
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Old 26th September 2012, 12:49 PM   #3
pos is offline pos  Europe
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I wonder if these diaphragms come from truextent or not.
Even JBL sources its bare diaphragms from truextent (and add its own voice coil).

The impedance of this 18sound sure looks nice, with no rise in the UHF (that said, rising impedance is not a problem at all with active crossovers...)
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Old 26th September 2012, 03:48 PM   #4
SunRa is offline SunRa  Romania
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Yeah, I was wondering about that also.

Anyhow, these seem to be some of the nicest CD's available. If they sound as good as they look and measure..
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Old 26th September 2012, 04:26 PM   #5
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Anyone know the exit angle?
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Old 26th September 2012, 05:56 PM   #6
pos is offline pos  Europe
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No exit angle per se: it is a throat-less design.
I think it should be considered 0 for horn mouth calculation.
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Old 26th September 2012, 06:16 PM   #7
SunRa is offline SunRa  Romania
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Aren't the 1480 and 2060 from 18sound of similar construction? And I've noticed people specified exit angles for them:

"18sound 1480 = 10 degrees, 2060 = 18 degrees" from another forum
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