I'm thinking for in Cyburgs needle or anything similar, anyone tried this driver? I couldn't find anything when I searched.
The very small Xmax and high Fs of the FE83 don´t lend it to real FR designs. This small Fostex is a very nice midrange-and-up driver (>200 Hz), but don´t try to squeeze any bass from it. Thats my personal experience. YMMV
Rudolf
Rudolf
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.pl?vopin&1134928131&read&3&4&
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.pl?vopin&1134928131&read&3&4&
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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
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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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
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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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
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
😎
You see the tool in this picture.
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.
No other driver, as I am a fullrange freak, actually.
No problem!
Franz
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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
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
In the interest of international unity, please share your horn recipe with the world.
Nice job!
Kofi
Nice job!
Kofi
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
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
Attachments
Franz,
Thank you for the fantastic suggestion. I thought that my next DIY would be a DAC but i am going to hold off and try the horn extensions. Your tool is ingenious.. simple and very effective. Have you tried to use a heat gun to soften the PVC?
Do you simpley sandwich the PVC between 2 sheets of 9mm ply and then guide the sheet over a stand that repressents the inner diameter and length of the horn?
And my double base relfex were heavily based on the design from the Fostex website. Just used a flared port to smoother lows.
Thanks
Thank you for the fantastic suggestion. I thought that my next DIY would be a DAC but i am going to hold off and try the horn extensions. Your tool is ingenious.. simple and very effective. Have you tried to use a heat gun to soften the PVC?
Do you simpley sandwich the PVC between 2 sheets of 9mm ply and then guide the sheet over a stand that repressents the inner diameter and length of the horn?
And my double base relfex were heavily based on the design from the Fostex website. Just used a flared port to smoother lows.
Thanks
Yes, first, I made my fronthorn experiments with a heat gun. But it is not easy to dissipate the heat well.
And another disadvantage: the heat is just applied from one side. The material is about 3mm thick and some kind of foam, so the other side will not get hot enough.
It is easier to use an oven. Maybe infrared from both sides could be an alternative.
Thats exactly the recipe!
Franz, looking forward for your enthousiastic report about the incredible improvement of the sound 🙂
Funny how you post threads and forget about them, only to find some very nice replies. I'll very possibly get a pair of these now to play with as computer speakers or similar low output near field monitors.
thanks guys.
thanks guys.
Hmm. I wonder. Up to 10cm, but can possibly stretch that. I wonder what would happen with a pair of these attached to either some bamboo Tangbands or the new FE126E in a smaller BIB box design... will tuck that one away for future reference.
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