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Old 4th July 2007, 12:23 PM   #1
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Default double horn, bib or angular spiral horn?

Hello,

I want to make a speaker with fostex Fe206E. I have these preferences:

Double Horn Design (wich has a fantastic look)
http://www.yildiz.edu.tr/~ilkorur/sp...tex_fe206e.htm

Helix-AG250BS small and looking at freq response it has great bass for his size and easy to build
http://www3.ocn.ne.jp/~hanbei/eng-angular.html

BIB the easiest and it seems to have a lot of bass. It's tall and slim and should be placed in the angle so it good for the style of the room. Looking at the frequency response it should be a funny speaker to listen.
http://www.zillaspeak.com/bib-fostex.asp

some have some experience on those enclosure?

thank you
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Old 4th July 2007, 12:55 PM   #2
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I don't know the spiral horns. Re the BIB pipe-horn the FR is nothing like as bad as it looks -most of that ripple is flattened by the room.

Onur's design is a big vent reflex box. Dave & I have done a cabient of this kind: see the Bruce enclosure on http://www.frugal-horn.com/spawn.html -an update of this cabinet with an improved response & lower group delay is being drawn up at this moment (the design revisions themselves are complete) However, both for this, and Onur's, you'd be better off using the FE207E. The 206 will be happier with a long-path, higher gain design like the Sachiko cabinet also shown on the above link.
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Old 4th July 2007, 01:03 PM   #3
OzMikeH is offline OzMikeH  Australia
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I've never seen anything like the Helix before. Thanks for sharing that one.
The BIB looks better with a Fostex 207.

Unfortunately I have no direct experience with these. I have some 207 in a Singular (plans available on BD design) But I am wanting to build some of the Spawn of Frugal-horn Bruce which might also suit the Fostex 206. Another cabinet that is worth considering is the Standard Fostex cabinet for the 208 sigma.

I think you should try the Helix, that looks quite easy to build, uses very little material and does not take a lot of space. Then keep researching and build something else as well because the Helix would have been so cheap.
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Old 4th July 2007, 01:28 PM   #4
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well I already built the 208 sigma cabinet for the 206 no words for it, every person that comes to listen is shocked, also rockers a and techno boy for the amount of bass. Beside the girl, that the listen a while and say "oh it's good" but in reality they don't care, also the music for them is or funny or boring, if it has not a drum with a lot of basses, and then the girl's ears are delicate so I can't turn up the volume too much because the highs hurts. Anyway girls in most cases has very nice body....

There's good design in that page, now I have to read everything...
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Old 4th July 2007, 07:24 PM   #5
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ok I'm very interested in Bruce and Sachiko horn.

Bruce horn is less expensive to build because it has less pieces, but it's more difficult to build because of the angle of pieces. Looking at the FR, is it more full at 100hz region thant Sachiko but it goes less down?

Sachiko have more pieces but it's easy. It has a dip around 100hz, so how il it sound?

I have fe206e in 208e sigma cabinet, and looking at FR on fostex pdf it seems to have a dip around 100hz, but in reality when you listen you have a full deep voice. The male voice at his lowest point I think goes donw to 100hz, right? so...
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Old 4th July 2007, 07:39 PM   #6
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Well, these are Derek's gorgeous Sachiko's (which he built astonishingly quickly):

You'll find his comments / views here: http://www.diyaudio.com/forums/showt...52#post1236952
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Old 4th July 2007, 07:52 PM   #7
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...and these are Tuomas's stunning Bruce's, with the FE206E. He used our dimensions / plans, but (obviously) being more than just a bit good at the old woodwork, he decided to build them with curved rather than flat panels. There shouldn't be much difference in the sound (the curved ones might be a bit smoother). His comments on the build are here: http://www.diyaudio.com/forums/showt...51#post1242951

Both Derek & Tuomas have done absolutely stunning jobs. There have been several other builds of both, plus the other designs, but these are the most recent.

Generally speaking, Bruce will go a touch lower, a bit more smoothly, but Sachiko has more gain, and controls the driver better, so it will go louder without distorting & have superior dynamics. A lot of the higher ripple in the response will be reduced in practice compared to the sim due to the multiple bends. We just offer a choice, and let the builder decide which suits them best.
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Old 4th July 2007, 08:05 PM   #8
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With the Sachiko I read that you could use a flat panel instead of this:
-
---
------
---------

I hope you understand what I mean.....

difference in sound?

Let's talk about BIB

With the Bib the fe207e it's better suited than 206e because if the highet qts, right? But looking at the FR the two driver have the almost the same response

anyway driver with lower qts and qes, such fe206e haven't a more controlled bass?

Do you know any other 8inch driver with the same quality as fostex around the same $$?
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Old 4th July 2007, 08:22 PM   #9
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Yes, you could use an angled panel rather than build it up out of multiple layers. In fact, the angled panel is strictly closer to the original Olson inspiration for the cabinet layout.

Within reason, the BIB pipe-horn isn't espeically bothered about the driver, if you design it for the driver parameters. The 206 will work just as well as the 207.

There's the Audio Nirvana range of speakers which are a similar price to the Fostex units, but don't really offer anything the Fostex drivers don't. The Visaton B200 is a superb driver, but best suited for OB use, or stuffing in the recently revised Loreena BVR box. Other than that, there isn't much else for the same money. The little Jordan units are stunners of course, but very small, so they're limited in terms of how much air they can shift.
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Old 5th July 2007, 02:15 AM   #10
OzMikeH is offline OzMikeH  Australia
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Quote:
Originally posted by testarossa2k

With the Bib the fe207e it's better suited than 206e because if the highet qts, right? But looking at the FR the two driver have the almost the same response
Have a closer look at the freq response of the 206 and the 207 before you buy anything. The 207 needs a helper tweeter unless your high end hearing is particularly bad. If I had my time again I'd use the 206. The 207 is useless above 12kHz, Phase plugs help a lot, bit it's still not really a "fullrange" driver. With phase plugs I suggest the surprisingly cheap FT17H with about 0.68 uF to start with. Did I mention Phase plugs? They really are mandatory.

I think the steps of the Sachiko are some of it's charm, it's a little boring without them, a plinth and top in the same style with 2-3 layers would make them more visually balanced, It's a good way to hide the wheels too! And you will need wheels if you need to move them about.
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