Anyone used the Fostex FE83e - diyAudio
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Old 26th October 2005, 08:36 AM   #1
Puggie is offline Puggie  United Kingdom
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Default Anyone used the Fostex FE83e

I'm thinking for in Cyburgs needle or anything similar, anyone tried this driver? I couldn't find anything when I searched.
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Old 26th October 2005, 09:03 AM   #2
Rudolf is offline Rudolf  Germany
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The very small Xmax and high Fs of the FE83 donīt lend it to real FR designs. This small Fostex is a very nice midrange-and-up driver (>200 Hz), but donīt try to squeeze any bass from it. Thats my personal experience. YMMV

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Old 26th December 2005, 09:24 AM   #3
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Default Fostex FE83E

I just finished building a pair of double bass reflex enclosures using FE83E's and the sound is surpsrisingly good. I am not suggestion that a small 3.5" drive can reproduce good clean fast base but the enclosure makes up for it a bit. The mids and highs are beautiful, very fast and crisp. If you like jazz or piano music give them a try... definitley no jungle or house. The system can be found here
http://forum.audiogon.com/cgi-bin/fr...8131&read&3&4&
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Old 26th December 2005, 10:15 AM   #4
Franz G is offline Franz G  Switzerland
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Neil

very good work, your double bass reflex DBR!

The FE83E is a very fine speaker for low levels, one of the best fullrange speakers out of the fostex line. I love this DBR box as nearfield monitor, just on my desk, not trying to fill a complete room with sound. Even at the European Triode Festival 05 some people where surprised about the reproduction quality!

The original plan comes from this link:

Fostex recommended enclosures

You easily can tweak them by linearizing the frequency response between 500 and 1500Hz. I do it very successfully by some accoustical gain, by conical front horns attached.

Inner diameter 72mm, outer diameter 21cm, horn "length" 7cm.

You will be surprised about the difference! It should be easy, to form such a horn by strong paper and to hold it just by hand in front of the speaker, for a quick trial.

Happy ears!
Franz
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Old 26th December 2005, 10:21 AM   #5
Franz G is offline Franz G  Switzerland
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Here, you see how I make them: out of some "Hartschaum" (sorry my limited english), some hard foam, made of poly vinyl chloride PVC.

I heat it in the kitchen oven to 90 to 110 degree celsius and form it by pulling it.

Cheap and you will not believe the difference!

Franz
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Old 26th December 2005, 11:06 AM   #6
kepa1 is offline kepa1  France
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Hello all,

And congratulations Franz for the good work. I'm quite jealous

Yet I'd like to know more about the way you build horns, I mean how do you shape them, do you have a special tool for that?

Plus I know there are various ways to calculate a horn, what is yours?
And what frequency do you achieve to reach with such a small driver? What other driver do you use for the bass range?

Sorry for these numerous questions.

Bye

PS: I own a pair of ACR FE130S
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Old 26th December 2005, 12:28 PM   #7
Franz G is offline Franz G  Switzerland
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Quote:
And congratulations Franz for the good work. I'm quite jealous


Quote:
Yet I'd like to know more about the way you build horns, I mean how do you shape them, do you have a special tool for that?
You see the tool in this picture.

Quote:
Plus I know there are various ways to calculate a horn, what is yours?
Easy: the inner diameter is the upper frequency of the horn, the outer diameter the lower frequency. The hornlength is the increase in volume between both freqencies.

Quote:
And what frequency do you achieve to reach with such a small driver? What other driver do you use for the bass range?
No other driver, as I am a fullrange freak, actually.

Quote:
Sorry for these numerous questions.
No problem!

Franz
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Old 26th December 2005, 12:42 PM   #8
kepa1 is offline kepa1  France
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What a cooker you are Franz!

Can you tell more about the recipe? Any website or link?

Anyway, I'll keep your ideas somewhere in my mind for future projects.

Alain
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Old 26th December 2005, 12:44 PM   #9
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In the interest of international unity, please share your horn recipe with the world.

Nice job!

Kofi
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Old 26th December 2005, 01:01 PM   #10
Franz G is offline Franz G  Switzerland
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Hi Kofi

First: are you really THE Kofi Annan personally, the friend from Adolf Ogi? If yes, I offer you two fronthorns for free but you should visit me at my home, next time you stay in Bern!

There is no secret but no exact recipe existing. Just try

It works best with small speakers, up to 10cm diameter. Bigger ones tend to "loose" too much highs, with this arrangement.

I used it successfully specially with Fostex FE83E and FE108Sigma.

The material is offered in the local hobby shop. It is easy to saw and sand it like soft wood.

Over 60 degree celcius it is getting soft and bendable.

Here another picture, same style horns attached to some Cornu Spiralhorns.

Link to Spiralhorns

Kind regards
Franz
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