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Old 20th July 2011, 01:54 AM   #691
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Join Date: Sep 2009
Location: Australia
Quote:
Originally Posted by jzagaja View Post
For matte black look better use Nextel coating.
I'm sorry to ask potentially 'really dumb' questions, but I suspect I haven't been following along carefully enough.

  • Where can I see colour/coating pics? (I'm very interested in matte/suede black)
  • Do I just order on DIY Sound Group ?
  • Are these shipping outside USA? (I'm in Australia)

(I'm talking about the SEOS-15 if it makes any difference)

Thanks :-D (All involved, your work is MUCH appreciated)

Last edited by davewantsmoore; 20th July 2011 at 02:10 AM.
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Old 20th July 2011, 06:48 AM   #692
rajacat is offline rajacat  United States
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You can choose any of the RAL( http://www.ralcolor.com/colors) colors for extra $....10%. Matt colors I don't know.
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Old 20th July 2011, 08:11 AM   #693
jzagaja is offline jzagaja  Poland
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Here you can see matte/suede black:

Waveguides and horns

We can ship directly or by DIY Sound Group.
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Old 20th July 2011, 03:45 PM   #694
Donovad is offline Donovad  United States
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Default Group Buy

Erich, I would like to get in on the current group buy pallet. Please let me know how to proceed (PayPal etc.) and where I should sign up.

Would like a pair of the JMLC1000 in blue and a pair of the Iwata 300 in white.

In reference to the Iwata 300 I'm looking for suggestions from other members on the advantages or disadvantages of a 1.4" vs 1" vs 2.0" compression driver when used in a 2 way system WITHOUT an additional super tweeter.

Thank you, Daniel.
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Old 20th July 2011, 04:12 PM   #695
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Quote:
Originally Posted by Donovad View Post
Erich, I would like to get in on the current group buy pallet. Please let me know how to proceed (PayPal etc.) and where I should sign up.

Would like a pair of the JMLC1000 in blue and a pair of the Iwata 300 in white.

In reference to the Iwata 300 I'm looking for suggestions from other members on the advantages or disadvantages of a 1.4" vs 1" vs 2.0" compression driver when used in a 2 way system WITHOUT an additional super tweeter.

Thank you, Daniel.
Go to augerpro's (Brandons) site and look at the data he's measured. Even the best compression drivers go to hell in the top octave. You'll see the problem in the CSD plot - it's basically swamped with resonances.

There are two ways to improve performance:

#1 - improve the diaphragm. For instance, use beryllium instead of aluminum.
#2 - use a smaller diaphragm

Click the image to open in full size.
A BMS compression driver and a JBL compression driver. The throat size is identical. The diaphragm size is not. The BMS is light years ahead of the JBL from 5khz to 20khz, even when the JBL has been upgraded. The JBL is light years ahead of the BMS from 1000hz to 2000hz, so there's still no free lunch, and they are both good drivers.

In addition to the size of the throat, you also might consider the size of the diaphragm, the geometry of the phase plug, and the geometry of the diaphragm.

IMHO, even a three inch diaphragm is a bit too large. I have personally found that the very small compression drivers sound noticeably better in the top octave than conventional compression drivers that have 3" diaphragms and 1" throats. For instance, the BMS 4540 and the Celestion CDX1-1425 both have diaphragms which are about the size of a conventional dome tweeter. And you can see the difference in the CSD - the data is right there on Brandon's site.

The downside is power handling and xover frequency, of course.

Last edited by Patrick Bateman; 20th July 2011 at 04:17 PM.
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Old 20th July 2011, 04:18 PM   #696
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Default color selection

I found the color chart to be at the following link:

RAL Color Chart | www.RALcolor.com

...slightly different than the link posted above

HTH
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Old 20th July 2011, 04:29 PM   #697
jzagaja is offline jzagaja  Poland
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BMS 4538 is a cleanest driver available - ringradiators are "sweet" sounding tweeters. Perfect with Beyma Studio. Highly recommended. With 2" you can end with exaggerated sibilants. Below Beyma 750Ti.
Attached Images
File Type: gif CP750Ti.GIF (16.5 KB, 477 views)
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Old 20th July 2011, 05:03 PM   #698
Donovad is offline Donovad  United States
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Default 1" vs 1.4" vs 2.0" comp drivers

Thanks for the response Patrick. I have a Geddes based speaker that uses the B&C DE 250 1" comp driver and I really like it. My thoughts on the Iwata 300 based system is to use a 1.4" comp driver as a compromise. Good extension out to at least 10k and one that would also allow me a lower crossover to take advantage of the waveguides directivity below 1000Hz. Also I much prefer the sound of the polymer diaphragm comp drivers that I have heard over the titanium ones. Although I haven't heard the beryllium ones.

Has anyone heard/used any of the Faital Pro drivers like the HF144 ?

Thanks, Daniel.
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Old 20th July 2011, 05:23 PM   #699
jzagaja is offline jzagaja  Poland
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Daniel - if you like Mylar drivers (like me) better save on BMS 4590. Iwata 1.4inch will be IMHO too long to keep highs wide. Have you considered ejmlc300?
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Old 20th July 2011, 07:30 PM   #700
Donovad is offline Donovad  United States
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Erich, sorry I need to change that group buy request to a pair of E-jmlc 1000 in blue. I left off the elliptical part.

Jzagaja, can you clarify the "ring radiator " and "Beyma studio" reference ?
I would definitely be interested in a E-jmlc 300 but haven't seen any measurements or examples of it being used yet. (?)

What type of crossovers are being used with the coaxial 2" BMS ?

Thanks, Daniel.
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