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Old 14th March 2012, 08:32 PM   #1031
jzagaja is offline jzagaja  Poland
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SEOS-10 Flatpack:

Waveguides and horns

made out of solid surface, as a kit for self assembly initiated by Erich (diysoundgroup). Cost unknown yet as it's prototype but for masses so keept low. Larger will come later.
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Old 14th March 2012, 08:36 PM   #1032
phusis is offline phusis  Denmark
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Quote:
Originally Posted by jzagaja View Post
SEOS-10 Flatpack:

Waveguides and horns

made out of solid surface, as a kit for self assembly initiated by Erich (diysoundgroup). Cost unknown yet as it's prototype but for masses so keept low. Larger will come later.
Ok, thanks.

What drivers(size, etc.) are thought to be used in the larger version - twin 15" per side as in the Everest?! Unless of course you're referring to the JBL K2's, which comprises one 15"

But, a great concept/initiative! I'm definately very curious about info on the larger version as well...

Last edited by phusis; 14th March 2012 at 08:48 PM.
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Old 14th March 2012, 08:52 PM   #1033
jzagaja is offline jzagaja  Poland
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Depends how big the back you want a pair of Sonido SCW300 (10cuft), Beyma 12BR100 (5cuft) or any low power BC, 18 sound, Eminence etc.
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Old 14th March 2012, 08:56 PM   #1034
phusis is offline phusis  Denmark
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Quote:
Originally Posted by jzagaja View Post
Depends how big the back you want a pair of Sonido SCW300 (10cuft), Beyma 12BR100 (5cuft) or any low power BC, 18 sound, Eminence etc.
Well, bring it on - 15 inches would be appreciated as well(EDIT: oh, you speak of pairs!!) The Beyma 12B100/R looks to be very appealing, speaking of 12" inch units, and then imagine two of them - my god, what a bliss...

Last edited by phusis; 14th March 2012 at 09:06 PM.
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Old 14th March 2012, 09:27 PM   #1035
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Please,
Any responce from a 4" compression driver above 10 kHx consists of heavily distortion rather than the sinusoidial input.- or music.
I have four Radian 950 here, two with Truexteent - and they all show the same dirty top-end above 10 khz.
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Old 22nd March 2012, 06:34 PM   #1036
jzagaja is offline jzagaja  Poland
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White SS-SEOS

aka "poured" or "cement"
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File Type: jpg SS-SEOS.jpg (88.3 KB, 531 views)
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Old 22nd March 2012, 10:17 PM   #1037
jzagaja is offline jzagaja  Poland
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A little play with Acourate. SEOS-15+4538 equalized to 20deg (EQ filter not shown) versus ejmlc-600 + DE250 (EQ filter shown) equalized to 0 deg in a range 600-16800Hz.
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File Type: gif SEOS-15-eq.gif (7.7 KB, 521 views)
File Type: gif ejmlc-600-eq.gif (9.4 KB, 529 views)
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Old 23rd March 2012, 07:58 AM   #1038
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by jzagaja View Post
A little play with Acourate. SEOS-15+4538 equalized to 20deg (EQ filter not shown) versus ejmlc-600 + DE250 (EQ filter shown) equalized to 0 deg in a range 600-16800Hz.
Hello Jack,

http://www.diyaudio.com/forums/attac...mlc-600-eq.gif

ejmlc-600 + DE250 (EQ filter shown) equalized to 0 deg in a range 600-16800Hz.

to be compared with the optimum frequency responses curves for stereophony defined by Earl Geddes in his paper on directivity :

http://www.gedlee.com/downloads/directivity.pdf

see figure N° 11

Here attached figure 11 (from that paper, copyright Earl Geddes)


Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 23rd March 2012, 01:28 PM   #1039
gedlee is offline gedlee  United States
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Jean-Michel

I think that you are taking my data a out of context. The lower figure in yours (the room/speaker layout) has nothing to do with the main figure, the two are describing different things, but you are linking them together. The curve that you show is not "optimal" in the sense of "desired" (I will admit to using the wrong words in my paper - I will correct that) but they are examples of what should be expected given some physical limitations of acoustics being described - namely that the lower frequyencies cannot have directivity but the higher frequencies always will. Hence, the purpose of figure 11 was not to show the "ideal" but to show what is likely to happen.

Thanks for pointing this out as rereading the paper this section could easily be misinterpreted as you have just shown. I will correct it shortly. To represent what you are trying to say they do represent, the curves should be much closer together and flat not curving downward.
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Old 23rd March 2012, 02:41 PM   #1040
Jmmlc is offline Jmmlc  France
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Hello Earl,

I remember that several authors (Keele being on of them I think) admitted that in the case of conventional loudspeakers (not CD designs) such limited increase in directivity and such orientation of the loudspeaker axis is benefitial to a wider spread of the listening area and to a better sterophony.

Best regards,

Jean-Michel Le Cléac'h
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