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Old 25th November 2007, 09:49 PM   #1
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Default new fullrange driver from emspeaker

Michel Fertin, the former owner of Fertin Audio, known for

its field coil line of driver has introduced a new

12 inch (30cm) - high efficiency (98db) -16 ohm -

fullrange (40hz-15khz) driver.

Match a light cone (34gr) with a strong field coil motor and

you get a very dynamic sound.

A whizzer cone keeps the coherence in the sound:

Michel Fertin prefer a gradual cone break up to do the hf than

the adding a tweeter with all the problems it implies.

He has design an open- baffle and a cabinet plan for the

diy.

http://www.emspeaker.fr/
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File Type: jpg lb12 o-baffle.jpg (5.7 KB, 3216 views)
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Old 25th November 2007, 10:39 PM   #2
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Default Nice nice nice !

Salut Gilles,
How do these compare to 20EX ?
"Just" better bass ?
Alain
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Old 26th November 2007, 12:43 AM   #3
tinitus is offline tinitus  Europe
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I thought it was a creation from the hands of his daughter, or at least I liked the idea as much as I like the look of that driver, it doesnt seem to produce much bass energy
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Old 26th November 2007, 03:57 AM   #4
BHTX is offline BHTX  United States
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Quote:
Originally posted by tinitus
as much as I like the look of that driver, it doesnt seem to produce much bass energy
34 Hz Fs with a low Qts of .21 with only 1.5mm Xmax? No wonder.
Of course, if it weren't for this, efficiency probably wouldn't be so high.
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Old 26th November 2007, 05:51 AM   #5
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Quote:
Originally posted by BHTX
34 Hz Fs with a low Qts of .21 with only 1.5mm Xmax?
Sounds like horn.

dave
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Old 26th November 2007, 06:21 AM   #6
BHTX is offline BHTX  United States
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Quote:
Originally posted by planet10
Sounds like horn.
Yep.
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Old 26th November 2007, 09:39 AM   #7
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Indeed.

Here's an interesting question though... why do so many websites, for the 'English' language option, use the US flag as the icon?
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Old 26th November 2007, 12:55 PM   #8
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Quote:
Originally posted by BHTX
Yeah, really..............
</OT>

even if 75% of my posts are certainly and deliberately OT , I can't agree more .......... this post of yours can't be more OT than it is .........

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Old 26th November 2007, 06:12 PM   #9
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Hi, as for the bass; the LB12ex has a variable voltage so

the Qts can be increased by lowering the voltage; on the other

hand you loose a bit in efficiency. The Fertin 20ex has a Qts

of .45 and I would not consider it has being soft bass , quite

the opposite. I listen at 10V so the Qts would be near .4,

acceptable I think.

There's always the option of building a cabinet; but open-baffle

sound is the only option for me.

Field coil (strong motor)+ high efficiency+ light cone; these

are the characteristics of the Fertin sound.

Everything is a compromise; the main thing is to get a great

midrange and compromise with the lf and hf. No fullrange

does everything 100% right but it's the overall sound that

is important: fast- detail- alive and with great tonality.
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Old 27th November 2007, 09:10 AM   #10
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Subthread on Cultural Diversity split off to here

http://www.diyaudio.com/forums/showt...hreadid=112644

dave
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