FE126E back horn, 127E double BR : who really built it ? - diyAudio
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Old 29th May 2006, 06:19 AM   #1
ow31 is offline ow31  France
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Join Date: May 2006
Smile FE126E back horn, 127E double BR : who really built it ?

I would like to build a pair with Fostex full range speakers, but, all along the threads it appears that it is impossible to get a real and full advice about one project.
Most of the time the same links are given and a large part of posts do not help speaking about quarter wave that it is not the subject about and no good enclosure mesurent are given with.

The 126E and 127E seems to be a pretty good solution, so if someone has built it, I would be very happy to talk with him as he use the Fostex regular or another enclosure.

Best regards.
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Old 29th May 2006, 06:34 AM   #2
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Location: NZ
This person goes into a lot of detail with photos during his attempt at building the FE127E DBR enclosure. And it's in French :-)


I have just finished building a pair of these. I am not an experienced speaker builder and have started another thread with questions about tweaking my enclosure. You might find this useful if anyone replies with suggestion:

FE127E enclosure tweaks to improve "honky" sound

Best regards,

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Old 29th May 2006, 09:30 AM   #3
ow31 is offline ow31  France
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I got it !

This is the only I can found which is really documented.

For the 126E I found many foto gallery but nothing about the sound.

Look for the 166 or 167 : this is the same, many topiks, but try to find enclosure parameters and listening review and you will be surprised : nothing.

I buit many pair of loudspeakers in my life from Fostex 103 to such big as 2 x 38 cm for bass, 17 cm medium and FT90 tweeter.

Nevertheless, because of the QTS of most Fostex speakers it seems to be logical to choose the enclosure box with the help of persons who built it.
Thanks for your reply.
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Old 29th May 2006, 10:20 AM   #4
Grz is offline Grz  Germany
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Default FE127


look here:

My english is'nt good! For Jazz, Klassik it is ok, but prodigy you can forgot with that little Driver!

Have fun with building hornspeakers!

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Old 29th May 2006, 11:49 AM   #5
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Location: Goulburn NSW
I have not built a DB using the fostex 127 driver however I have built this design using a 4 inch redback driver that is very similar to the FE 103, it may actually be from the same factory.

Bottom line is I built these as an experiment and have carried out all sorts of mods to tame the midrange etc, the end result is quite stunning sonically and has exceeded all my expectations, I imagine the proper fostex driver implementation would be better still.

Have a look at these posts on to get some insight in the processes I went through and the mods, I am sure many will apply to the 126/7 drivers as well.

Just two things, my implementation is run in conjunction with a bass extender module that is available as a kit from altronics in Australia and the boxes also have a top rear facing port in the top outside corner, with a reflector to send some bass into the corner. I know it sounds like it wouldn't work but it does, these speaker utterly cream my B and W 602 s3s and the 2 other pairs speakers I have that sound better than the 602s. Amazing from 4 inch drivers!

They actually produce useful output now down to about 40Hz, no I am not kidding, however I think a supplementary sub that cuts in a 55hz or so would complement things nicely, which is something I'm working on.





I hope this is helpful, the one thing I have found is that smaller drivers such as these are very tuneable and it is really worth putting in the time to tinker.

All the best
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Old 29th May 2006, 02:45 PM   #6
ow31 is offline ow31  France
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Thanks for theese answers !

At this time I use my daugther loudspeakers which are FE103 BR.

That the reason why I look for just more bass...

So I would like to try 126/127 if someone has a good listening experience from a DiY realisation.

It will be for a 12 m listening room and not high level.

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Old 30th May 2006, 02:53 AM   #7
westend is offline westend  United States
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There are a few threads on this forum about Fostex BLH. This is the latest: The Frugel-Horn Project Also, check out http://fullrangedriver.com/forum/viewtopic.php?id=328 for listening impressions of FE126 BLH. I am currently finishing a set of these and will post my impressions when done. Until then, use the "search" function of the message boards .
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Old 30th May 2006, 05:16 AM   #8
ow31 is offline ow31  France
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Nice to post your impressions...
but I would like to avoid loudspeakers which horn is on the back because of the relation with the wall.

Now I look for double BR for 127, Fonken.

I expect your result will be fine to be added on my list.
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Old 30th May 2006, 09:35 PM   #9
no xo is offline no xo  United States
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Location: Genoa IL far west Chicago suburbs
I`ve built the double BR`s for the FE127E`s and am very happy with the sound. I made the box about 12" taller and filled the bottom chamber with sand , to act as a stand and improve stability. Lowest octave missing and on most music they`re much clearer sounding than the Infinities I replaced with. There`s my opinion, FWIW.
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Old 31st May 2006, 10:58 AM   #10
ow31 is offline ow31  France
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Thanks for answering !

Good idea to make the stand with sand.
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