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PostPosted: 28 Apr 2011, 06:34 
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Jaycar (where once I worked) have a range of good tweeters. The ones I do use with the Fostex is ribbons. For the time they are not in use but I should bring them out. I did notice tonight that the bass does not extend to the depths of the Eclipse. A suby may be required.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 01 May 2011, 06:23 
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As of a recent post I once more pulled out the Fostex206 backload horns. These were driven by my 3W 6AS7 set amp. I defintely enjoyed the horns. I played a few tracks which I know very well and are well aware of their mids and low bass. The horns were far to forward with the mids and made the singer sound like she was singing on my lap (I could do worse if it was Mick Jagger). I could forgive that. But the bass just had no extension. The Eclipse went a few more octives lower. For these two reasons I have put the horns away again. Yes the sound stage from the horns was excellent and imaging off-the-planet. But what I like about my SET amp/Eclipse combination just wasn't there.

But I am not blaming the horns. I don't think they get on well with the set amp which is very fussy on what it will sound good on. I will be building more tube amps in the future and once more the horns will come out.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 07 May 2011, 11:15 
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I have the same complaints. There is not much that can be done about the low end which falls off rapidly. You may want to try experimenting with pulling the horns into wall corners.

With the forward response, I find that listening off axis helps.

The other option would be to play with a Baffle Step Correction filter. This should shelf the forward highs and that will make the bass sound more balanced. The drawback is that this may hurt the excellent midrange and spacial attributes of the horn.

Cheers

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PostPosted: 07 May 2011, 19:45 
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Gio:

Yes I thought about the BSC. I know a few who use these drivers for mid-range only and handle the bass and very top end with other drivers. I have a feeling, from what I can remember, the two chamber bass box which I made my son with one of my KTEE SE amps, the smaller, simpler design has a stack more bass with no loss of mids and treblem. Yet to confirm. But I do have a pair of boxes already, just need painting and assembly.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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PostPosted: 11 May 2011, 12:16 
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Hard to imagine that the smaller double bass reflex enclosure has more low end.

I just got a microphone so hopefully when I get it set up properly I can get some good in-room measurements of my horns.

Cheers

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PostPosted: 18 Sep 2012, 00:15 
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I put together a page showing some of the modifications and tweaks I typically do with the stamped frame Fostex drivers.
http://diyaudioprojects.com/Drivers/Ful ... ns-Tweaks/
Cheers

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