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Fostex FE208-SOL box?
Fostex FE208-SOL box?
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Old 2nd August 2019, 09:10 AM   #1
vcelkamaja is offline vcelkamaja  Czech Republic
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Default Fostex FE208-SOL box?

Hi, I was lucky to get 2 Fostex FE208-SOL limited editor full range speakers :-) What I want to do is to use them in a single driver BLH enclosure.

While I looked into Half Chang, Solo206 and Dallas II plans I'm not sure which one to pick - I think all 3 of them were originally designed for "standard" FE206 EN.

Can someone please help me to decide or even recommend a different box? What I'm looking for is a dynamic, wide space, balanced bass system for jazz and vocals.

Fostes FE208-SOL spec here: Fostex FE208-Sol - 8" Large bande

Thanks
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Old 2nd August 2019, 09:27 AM   #2
Scottmoose is offline Scottmoose  United Kingdom
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Definitely not the former (unless you have a high output impedance amplifier or the equivalent series R, either of which are pretty much mandatory for this unit if it's to be used without compound loading given the 573.33Hz mass-corner frequency). I designed it for the FE207E with the then-current FE206E as an option provided appropriate correction was made.

The Solo 206 ismore or less a stretched BK series horn; it's OK but not ideal for this unit. Dallas II would probably be the better bet of the three you mention. Otherwise -realistically you need a bigger horn, e.g. my Vulcan or Kirishima. A simple pipe-horn would also work, again assuming the necessary amplifier or series R, and that you can position them suitably in the room.
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Last edited by Scottmoose; 2nd August 2019 at 09:29 AM.
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Old 3rd August 2019, 06:14 AM   #3
vcelkamaja is offline vcelkamaja  Czech Republic
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Thank you Scott. Unfortunately Vulcan and Kirishima are too big for me.
So I will likely proceed with Dallas II as you recommended.
Two questions:

1. Are there any thomgs you would recommend as mods of current Dallas II to fit to FE208 SOL. I think it was originally designed for FE206 EN.

2. Series resistor - this driver is 8 ohm and I plan to use with some SET amp based on 300B, 2A3 or so. Can you please elaborate on why do I need a resistor and how do I calculate its value?

I have to note that this is my first full range BLH speaker so any suggestion is more than welcome
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Old 3rd August 2019, 07:26 AM   #4
Scottmoose is offline Scottmoose  United Kingdom
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1/ It was designed for the FE206E (earlier version). Not really, I didn't design it and it won't function as well with the 208-SOL as with the design unit; technically you'd need to change the rear chamber volume and horn profile. But it's still likely a superior option as-is than the other two enclosures you mention with that driver.

2/ You're unlikely to benefit from any series R with a 300b amplifier; it will probably have a relatively high output impedance, and most of them don't have very much power in reserve so you'll want to keep system sensitivity up.
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Last edited by Scottmoose; 3rd August 2019 at 07:32 AM.
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Old 5th August 2019, 10:29 AM   #5
zmajz is offline zmajz  Croatia
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Well, this is my experience:
I had built Dallas II strictly by the R. Clarke plans for FE 206e using that driver and must say that it is the best BLH for it (heard some other BLHs for 206e, not even close to it) and it happened on first Croatian Triode festival in 2010th compared it directly to FE208ez (sigma) in Jericho horn (Bernd Timmermans from Hobby Hifi) and must say that they were very close...
But, FE28ez used Fostex helper Tweeter (don't remember the model but the price: arond 200 US$) and it was great sounding speaker. 208ez is better speaker than 206e but needs tweeter and that is minus for me. On other hand, 206 in Dallas II was better in general (must be subjective, I think), no xover and tweeter, that's it. Fe208 in Dallas II was not good sounding (at list, not good as it can be), Jericho horn is great for it.
I do not know to which of this two drivers is FE208sol closer, but do not use it in Dallas II, it does not match to that BLH. Dallas II is projected for 206e and 206e only, not even for 206en!
My 2$ and 55 cents.
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Old 5th August 2019, 05:54 PM   #6
GM is offline GM  United States
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FYI/FWIW/YMMV: a bog simple prosound type parabolic BVR [AKA 'scoop bin'] in ~49 L, sims plenty loud on two clean watts even in 2pi space with a total of 8 ohms output impedance and/or non inductive resistor, or less as it's moved near/at a wall or probably none if in a corner. Add more damping to 'taste' for a more HIFI/'girl and a guitar' presentation unless Joan Jett or similar is more your style .

GM
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File Type: txt FE208SOL_BVR.txt (1.0 KB, 25 views)
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Old 6th August 2019, 08:48 AM   #7
vcelkamaja is offline vcelkamaja  Czech Republic
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thanks for all comments and feedback. I won't be able to design specific box for for FE 208 SOL and I'm rather looking for something already available (that is why Dallas II, BK-20, Half Chang or Solo206) which would best fit to 208 SOL driver.

As it seems Dallas II seems to be the best option out of available designs I tend to prefer going forward with it. Not sure if any modifications to the current Dalls II would help (electrical or mechanical).
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Old 11th August 2019, 11:25 AM   #8
vcelkamaja is offline vcelkamaja  Czech Republic
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Ok so my FE 208 SOL arrived and hey are impressive - huga magned, quite heavy

There is an official Fostex recommended plan of BLH showing dimensions 900 x 350 x 450 mm:

ヤフオク! - ☆FE208-Sol推奨キャビネット「準両面シナ仕様」...

Also I found some kits (Japan only? )
Eg this one (900 x 265 x 425 mm)

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Or this one (876 x 300 x 450 mm):

Google Translate

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They seem to be more compact compared with Dallas II. Any idea what would it mean for the sounds? Less bass?

I like the smaller size and something around 900 x 300 x 450 mm would be great).

Any comment or suggestions?
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Old 13th August 2019, 06:15 PM   #9
vcelkamaja is offline vcelkamaja  Czech Republic
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Any opinion please?
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Old 13th August 2019, 08:01 PM   #10
DrBoar is offline DrBoar  Sweden
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There is a 2008 version of the Jericho horn very similar to the first but it has internal helmholtz resonators to remove some peaks.
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