Is the FE 108EZ a bad Driver? - Page 3 - diyAudio
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Old 28th January 2006, 07:26 PM   #21
Jaime is offline Jaime  Uruguay
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Fhis is the horn
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Old 29th January 2006, 08:22 PM   #22
LilMik is offline LilMik  Germany
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hello all,

yesterday i went to a hifishop and asked the dealer what he thinks about the measurement HobbyHifi made.

he told me that they are wrong ... aarrgghhhh ... of course he did, he want's to sell the fostex drivers . then he switched on his computer and i could see his own measurements: the frequency response from the 108ez -and various other fostex drivers- looks similar to the frequency response form fostex. you can see a small dip at about 1000hz, but it is not drastic.

he said that he would measure the frequency response in front of me if i would buy the drivers at his store.

after all, i really think that HobbyHifi is wrong.

@franz g

hello franz,

are you "franz g" from the german forum www.audiodiskussion.de ? i think you are.

i know that you have the little fostex 103e in the recommended enclosure, or at least that you had it. could you please tell me the diffrence between the 103e and the 108ez; which sounds better in your opinion? and why?

have a nice day
lilmik
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Old 31st January 2006, 12:18 AM   #23
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Quote:
Originally posted by LilMik
hello again,

searching this fourm up and down, i found a nearfield measurement of a 108ez in an 2 liter sealed box. look at the picture. scary . on the other hand, look at the frequency response from 7000hz and upwards. i really don't think the 108ez has a frequenzy response like this.

josephjcole made the nearfield measurement. here is the thread, it is post number 6 --> FE 108e Sigmas cheap


Quote:
Originally posted by Nelson Pass
I haven't measured the 108EZ, but there's no way
that it has that dip. It's an enclosure or measurement
artifact.
Sorry, I've been out an about away from the form for a bit... I do think those measurements are fairly correct. That graph was nearfield, but they closely resemble the measurements that I did at 1 meter. With or with out time gating to remove reflections. I've done many different measurements of these drivers in different enclosures and they all have this hole.
Having said that I still listen to them and love them. I would not hesitate to recomend this driver to anybody. In the right application it can really sing. I've got mine in some wide range 2-ways (with a 12" pro-sound driver) which I've found to work very well, as the 108's are not exactly bass monsters . Well for that matter they don't have the air of a good tweeter either 10kHz and up is not that great. Maybe I'll switch to a 3-way at some point. No plans to drop the 108 though.
Joe
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Old 31st January 2006, 06:50 PM   #24
LilMik is offline LilMik  Germany
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hello all,

here is the link to nelsons article i mentioned above --> http://www.6moons.com/audioreviews/f...firstwatt.html

below you can see a near- and farfield measurement from the 108ez. it's from nelsons article.

have a nice day
lilmik
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Old 3rd February 2006, 01:25 PM   #25
Rudolf is offline Rudolf  Germany
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This are independent measurements of the FE 108EZ in the Cornu spiral horn (without the front horn AFAIK). They clearly show the dip too.
Maybe thatīs why Franz G created a front horn for them.
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Old 3rd February 2006, 01:49 PM   #26
Vikash is offline Vikash  United Kingdom
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The difference between the independently measured in post 4 and Fostex's measurement can perhaps be somewhat attributed to the smoothing?
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Old 3rd February 2006, 01:52 PM   #27
Vikash is offline Vikash  United Kingdom
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Quote:
Originally posted by LilMik
how does fostex smooth there measurements. if you use 1 octave or 1/2 octave, a small but sharp dip may disappear or look hamrless, if you smooth over 1/16 octave, it can look very bad.
My apologies, I just read this. This is exactly what I saw when looking at the graph. The Fostex graph appears to be smoothed to 1, or 1/3 octave which might make that dip look much more benign.
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Old 4th February 2006, 11:45 AM   #28
thalis is offline thalis  Greece
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The dip is probably there. But it is not unfair to present 1/3 octave smoothed measurements where the dip doesnít look bad, rather it is unfair to present unsmoothed (or smoothed to 1/12 octave for instance) graphs where the dip looks scary. The 1/3 smoothing isnít there for nothing, it isnít a random choice but a well thought one. It is coming from years of experience and it is correlated with the way our ear responds - our ear smoothes frequency regions in such a way. If unsmoothed frequency responses of well-known speakers were to be presented you would all be very scared and would come to the (apparently false) conclusion that all these speakers are not about hi-fi.
Furthermore, our ear corresponds well to bumps but is more insensitive to dips. Someone should perhaps look after bumps in 1/6 smoothing, and dips in 1/3 octave smoothing. Lastly, our ear doesnít reveal the same sensibility in every frequency region (and Iím not talking now about equal loudness contours) Ė it responds more if a same octave region dip is in the 300 Hz region for instance, were it will perceive changes in tonal balance - voices and string would seem thinner, but doesnít easily recognize even a broader dip in the 1KHz region, which doesnít easily change the tonal balance)
This fostex driver is probably of very good quality and its 1/3 octave response reveals part of this reality.
Regards,
Thalis
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Old 4th February 2006, 01:38 PM   #29
Vikash is offline Vikash  United Kingdom
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well explained
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Old 9th March 2006, 02:06 AM   #30
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I love the FE108eS. What it does in the mids is sublime. And now with Ed Schilling advocating the FE126 for his horn, a fair number of FE108eS are popping up used cheap :^)

dave
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