FE 127e vs. FE126e - Page 2 - diyAudio
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Old 16th December 2004, 03:05 AM   #11
jlsem is offline jlsem  United States
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I've wondered about the performance of Fostex drivers with chip amps. My experience is that tube amps bring out the best in these drivers while SS and chips produce that "rising response that can hurt your ears". According to Nelson Pass that can be shown empirically, the exception being a current source SS amp as opposed to a voltage source SS amp.
I gave up on the smaller Fostex drivers because of weird ear-ache causing rising response, even with SET tube amps. I built three cubic foot sealed boxes with Tru-Sonic FR80's to replace pretty but trying fe103 TQWP and now all is well. I would like to try Fostex 225's in a backloaded horn in the near future. Nothing smaller than 8" for me from now on (please hold double entendre jokes, "that's what she said last night", etc.).

John
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Old 17th December 2004, 11:26 PM   #12
doggy is offline doggy  Canada
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Hi all

Probably true about the ss gainclone adding brightness; but I love the power and good tight bass. I also have some bottlehead 2a3 paramours which have been unplugged for a few months; it's like having different cars in your garage. My gc is the lm3875 briangt deluxe kit. fun to build and inexpensive.

cheers
doggie
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Old 18th December 2004, 01:50 AM   #13
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I have among others a pair of FE108EZ Sigma's in D-101a Swans and FE208 Sigma's in Jerico horns and run them with many different amps / preamp combinations including an inverted gainclone through a VSE FVP5 that I built from Allen's book and found the gainclones + Fostexs' to be a very good combination. Horses for courses I suppose.

Andrew
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Old 18th December 2004, 01:13 PM   #14
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Horses for courses I suppose.
Exactly. There will always be some that don't care for the Fostex sound.

CD, back to your question.
I think it may come down to what type of enclosure you want to build. The Fostex recommended design for the FE126E (BLH/BR hybrid) is probably going to be your best bet there. We've been running sims between the 126 and 127 on another thread and the 127 looks much better in a TL than the 126, IMHO.
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Old 19th December 2004, 09:13 PM   #15
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Higher qt of the 127 naturaly make it more apropriate for a TL. But, for the correct application the 126 could be better: aon the one side the magnet is much, much bigger (the xx7 series is just meant to be the HT series, therefore smaller main magnet + shield), therefore more detail, specially on the high end. On the other a rising but less "peaky" response that can be easier to manage. I would therefore go for the 126 unless expecting full range on a TL or BR.

Really intersting is not a question about the best tuning/enclosure for each driver, but about the sonic qualities, specially the 126 against the ff85k, probably the most acclaimed smaller fostex.
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Old 21st December 2004, 08:52 PM   #16
CD is offline CD  United States
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Thanks Timn8ter. I've been following the reference project thead with great interest -- it's really educational to be able to sit in on these conversations.

I used the FE127E, in a short-wide t-line and reported results in another thread,

T-line with FE-103E as computer speaker?

to which you added a comment there about possible problems interacting with the chip amps. That make sense. I do note that most people using Fostexes are not listening in the nearfield, and many seem to prefer tube amps.

It might be interesting over time -- maybe I should ask this over in class D after more people have the SI amps running -- to figure out what kinds of drivers do interact well with the tiny chip amps. It's just so convenient to have a plausible amp that's smaller than most crossovers and runs off a battery.
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Old 21st December 2004, 08:59 PM   #17
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As I'm typing this I have a pair of CSS WR125S as computer speakers being driven by a SI amp. Works very well.
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Old 22nd December 2004, 04:21 AM   #18
CD is offline CD  United States
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Thanks! I did a little searching and reading on the WR125S. Maybe next birthday I'll treat myself to new drivers. I didn't see among your posts much detail on your enclosure, though -- have you put them up anywhere?

Because I'm really lazy, I'm wondering whether the WR125S might be a plausible drop-in replacement for the FE127E in the vented box/mini t-line that I made (described in link in my last message).

The main difference in specs seems to be that the WR125 has Vas of 5.8L while the FE127E has Vas of 9.9.

The actual enclosure I made has about 22 liters, though one could probably reduce that with vigorous stuffing in places.
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Old 22nd December 2004, 01:03 PM   #19
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I used the recommended enclosure size of 7 liter. I've heard it in slightly larger cabs (11 liter) and it still does well. I also heard it in a version of a T-line and while the mids were great the bass was a little thin compared to the smaller BR.
Sorry for the OT.
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