Thanks. I read online someone stating the 107e had a much smoother response than the 103e, altho now there is only the 103En available - I can't find much in the way of personal reviews but it looks smooth enough on the spec sheet. I'd like to try the 103En in a 2 way 1st order design or by itself in a back horn. By most accounts the 127e was rather 'shouty'
The old 103 & 107 were much of a muchness on that score. Slight edge to the 107, but only slight. The current 103 is similar, and about the flattest of the regular series of drivers that Fostex produce, barring the FF85wk.
Most accounts? The majority consensus on the 127 was that it was one of the smoother of Fostex's old E series units -certainly more so than either the old 126E or the current 126En, which give a fairly accurate representation of the Lowther sound. Which is not to say it was perfect (it was far from it).
Most accounts? The majority consensus on the 127 was that it was one of the smoother of Fostex's old E series units -certainly more so than either the old 126E or the current 126En, which give a fairly accurate representation of the Lowther sound. Which is not to say it was perfect (it was far from it).
It goes about an octave lower (to ~83Hz) and is relatively "beefier" in the universe of tiny Fostex drivers. The drivers are roughly similar in character (neutral, flat, nice dispersion, neither shouty nor bright when used near wall boundaries when there's no BSC).
Under ideal conditions, they let you "hear into the music" like headphones, which compensates for their lack of dynamic range. In my mind, it's a shame they are not more popular relative to the peakier Fostex but oh well.
I think that's the problem -dynamic range when run solo is roughly equivalent to the square root of jack. Although ironically, if you follow Fostex's published Xmax figures (method unknown) it has slightly greater Vd than the larger unit: a gigantic 3cm^3 compared to the 126s pitiful 2.275cm^3. 
I ran a sim of the TL in the video and compared to an optimized MLTL here: http://www.diyaudio.com/forums/full-range/235751-fe103en-bib-t-l.html#post3486968
Can i get plans for your build?
If you are still around, can i get the plans for the speakers you built here?
Thank you.
If you are still around, can i get the plans for the speakers you built here?
Thank you.
Back in 2012 I made some investigations and posted the numbers in the second post (#2 in this thread) - just estimations, but roughly they are correct; I never got to build a pair but I have not lost my interest in the design or the Fostex 103EN.
Another take on the same enclosure - My Other Listening Room – transmissionlinedesigns - and the link to the video (a copy, the original is gone) - YouTube
Don't be shy about posting in case you build something...
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