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Old 25th December 2008, 11:28 PM   #1
miksin is offline miksin  Finland
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Default Fertin 20 ex model 7?

Instead of spoilin more that invaluable "Fullrange, are you guys kidding yourselves?"-thread, puttin' up a new one:

Does anyone yet have some first-hand experiences of that new Fertins 20 ex model7, with spring suspension?

As a owner of a two pairs of very "surroundless", "spiderless" and pretty old drivers, I'd really liked to hear some impressions of those Fertins. That's because all rumours I've heard about those Fertins are pretty much similar to my observations of abovementioned vintage fullrange driver. i.e,. clean, open and transparent mids, very great speed and detail, smooth tone and so on.
Could perhaps be something common to the surroundless structure?
So, anyone yet listened that Fertin 20ex model 7?

...and as long as I recall, kudos to the Fertin guys to not to selling "first time ever revolutionary new structural design, which overtakes all previous and so on."
They obviously are civiliced enough to know that -as normally- for shure someone somewhere someplace already has done it. Whether they were aware about the specific designs or not. Which, BTW really is a detail I'd liki to know, whether they knew about the existence of preceeding similar constructions.
I guess they did. They'd better do, because I am aware of at least three similar designs, and I am the one who does not design, manufacture or sell wideband drivers.
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Old 25th December 2008, 11:36 PM   #2
tinitus is offline tinitus  Europe
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I have seen a picture somewhere, instead of surround its something with 3 stiff wires connecting outer chassis with voicecoil
I think mr Fertin commented that you shouldnt play loud with these units
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Old 25th December 2008, 11:59 PM   #3
miksin is offline miksin  Finland
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Quote:
Originally posted by tinitus
I have seen a picture somewhere, instead of surround its something with 3 stiff wires connecting outer chassis with voicecoil
I think mr Fertin commented that you shouldnt play loud with these units
Oh. I've understud the pics I've seen in a way that the outer edge of the cone is connected to the chassis with three wire springs.
I yet have no whatsoever kind of observation of voice coil/inner edge suspension solution.
Just different pics, we have seen, perhaps?
I guess it could not be the same suspension for both outer and inner edges of the cone, couldn't it? Now _that_ would be something new, I think!
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Old 26th December 2008, 01:36 AM   #4
tinitus is offline tinitus  Europe
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Quote:
Originally posted by miksin


Just different pics, we have seen, perhaps?

My memory may not be so good
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Old 26th December 2008, 02:45 AM   #5
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Quote:
Originally posted by tinitus
I have seen a picture somewhere, instead of surround its something with 3 stiff wires connecting outer chassis with voicecoil
Like these?
http://www.field-coil.com/field-coil/RF-C804/
(more info & picts on home page)

for "surroundless" & "spiderless" from "kidding yourself" thread:

http://www.vivaudiolab.com/E-evanui_signature.html
http://blog.stereophile.com/rmaf200...anui_signature/
no surround or spider, it just floats in the magnetic field.
only connected by the two wires going to the cone.
when I heard them playing the guy demoing them just pulled the cone off by the phase plug, while it was playing, & handed it to me, then put it back in.

sound quality was, well, underwhelming.
pretty cool looking, but not really all it's cracked up to be...
better than open baffle though.
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Old 26th December 2008, 03:56 AM   #6
mp9 is offline mp9  United States
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Default implementation not anything like B&W nautilus surroundless midrange driver?

cone bears on a foam ring/mech impedance like the cone - absorbing standing waves normally reflected from surround edge. didnt know of the 20ex model 7 or any other without a surround. just read it rolls ~80hz. interesting though cant see myself spending that much.
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Old 26th December 2008, 04:00 AM   #7
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From what I hear it looks liker this:
Attached Images
File Type: jpg fertin 20ex mod.7.jpg (95.1 KB, 1142 views)
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Old 26th December 2008, 11:50 AM   #8
miksin is offline miksin  Finland
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Ok, found another pic.


Click the image to open in full size.

So it seems that larger diaphragm drivers has a somewhat simpler suspension. Or is it the opposite?

Still havnt found pics of voice coil suspension/spider.
But, if that's too realized with carbon wires, i guess it's pretty easy to figure out how it looks.

Oh my, it almost makes me to want t have a pair of them, just because of the looks.
Its just _gorgeous_.

Lookin that very large (metal?) phase plug I am afraid that the voice coil is not made of paper.

And how is the clearance between the cone edge and driver frame?
It is not clearly visible in the pics, but the edge does not quite looks as free standing, but as if being supplied with a collar, where the springs are attached, so no free/open edge here, I guess-

Anyway, that's one fiendishly clever construction. I love it!
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Old 26th December 2008, 12:55 PM   #9
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Yes, the opposite.
That picture is quite a bit different, and more complicated than what I saw.

Hopefully it sounds better!
Anyone hear it?
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Old 26th December 2008, 01:21 PM   #10
miksin is offline miksin  Finland
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Could this "cantilevered suspension pivot point" contribute lower fS?

I've seen two pretty different fS numbers given, 80 and 27 hz.
Perhaps the higher one is to smaller unit, with "straight springs".
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