fostex 103 cabinet in 3/4" plywood - diyAudio
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Old 26th April 2005, 05:04 AM   #1
Faitour is offline Faitour  United States
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Default fostex 103 cabinet in 3/4" plywood

After building a TQWT and a Zigmahornet I decided to try the Fostex recommended backhorn for the 103. Since 15mm plywood was unavailable I redrew the plans using 3/4" ply and converted all dimensions to inches. Are there any changes I need before I start construction.
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Old 26th April 2005, 05:17 AM   #2
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We ended up building one out of 5/8" only to discover that 15 mm was available. Still haven't made them listenable yet (FE103As)

dave
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Old 26th April 2005, 12:10 PM   #3
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Default Zigmahornet

Hi Faitour, I have heard good things about the Zigmahornet and was planning to build one soon. What makes you choose another design now? something you disliked about the Zigma? and may I ask you to indicate me a link with plans of the Zigmas? I have found a site with pics of it, but no plan.

Jean Hiraga (from l'Audiophile) seem to insist on using thin baltic birch like 12mm and 15mm for his smal tqwp designs rather than pressed wood.

Keep us posted about your results.

Sylvain
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Old 26th April 2005, 03:06 PM   #4
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Faitour,
It looks good to me, kind of a pain to convert them isn't it? I converted a swan-101a in 3/4" wood for my brother's fostex 103, ended up turning out pretty good. I'm sure you will be quite pleased with the BLH. Only thing else I would think of is to bevel out the back side of the driver opening, I've found this to really help with my fostex 108. But maybe you were already planning on doing that anyways.
Fellow North Carolina speaker geek.
Joe
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Old 26th April 2005, 03:28 PM   #5
Faitour is offline Faitour  United States
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Quote:
Originally posted by planet10
We ended up building one out of 5/8" only to discover that 15 mm was available. Still haven't made them listenable yet (FE103As)

dave

Why are they not listenable yet? Is there alot of tweaking that needs to be done on them? From what I could see on the plans there didn't seem to be any stuffing required.
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Old 26th April 2005, 03:28 PM   #6
Faitour is offline Faitour  United States
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Default Re: Zigmahornet

Quote:
Originally posted by Sylver300B
Hi Faitour, I have heard good things about the Zigmahornet and was planning to build one soon. What makes you choose another design now? something you disliked about the Zigma? and may I ask you to indicate me a link with plans of the Zigmas? I have found a site with pics of it, but no plan.

Jean Hiraga (from l'Audiophile) seem to insist on using thin baltic birch like 12mm and 15mm for his smal tqwp designs rather than pressed wood.

Keep us posted about your results.

Sylvain
Hi Sylver300B
I liked the Zigmahornet alot but I thought that I might get a little more bass out of the backhorn cabinet. I am using a Pilot 246 stereo amp to drive the Zigmahornets and I use the center channel to drive a passive sub to fill out the bass. The wife thinks the Zigmahornets are cute so the new cabinets will have to sound better to get them into the living room. I too had a hard time finding plans for the zigmahornet but I did find a poor jpeg of a plan that I redrew. If I can find the drawing I can email it to you.
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Old 26th April 2005, 04:03 PM   #7
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Default Re: Re: Zigmahornet

Quote:
Originally posted by Faitour

I liked the Zigmahornet alot but I thought that I might get a little more bass out of the backhorn cabinet.
I imagine you'll get more than a little. I have not heard the zigmahornet, but my brother did listen to them in comparison to his Swans (both with fostex 103). He said the zigmahornet was lacking quite a bit on the bottom end in comparison to the swans. I would imagine the recomended cabinet would give similar results to the swans.
Joe
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Old 26th April 2005, 05:51 PM   #8
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Quote:
Originally posted by Faitour
Why are they not listenable yet? Is there alot of tweaking that needs to be done on them? From what I could see on the plans there didn't seem to be any stuffing required.
At the moment they have a very closed in midrange which makes them unlistenable. We managed to make the Buschorn IIs with FE108es do something similar and we know how we did that, so that is where we will be playing next. I have a bunch of spacers which will allow me to change the size of the compression chamber (the FE103A has a bit higher Q than the FE103).

dave
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Old 27th April 2005, 03:00 AM   #9
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Hi Joe et all,
having built and listened to the Zigmahornet and the Swan 101a (FE108EZ) and also the Fostex recommended backhorn for FE103, my opinion is as follows.

The Zigma is a very nice speaker, yes, in comparison to the 101a it lacks bass but on its own its not that bad. If you need bass then add a sub.

The 101a (which my wife refers to as E.T.) is so far my overall favorite of all the 4" based enclosures I have built. Clean and clear with great bass, yes bass, looking at the driver you would not believe it but run some test tones through it and listen. It does however take some effort as there are IIRC some 30+ pieces of wood per cab but I think its well worth the effort.
The Zigma is much easier.

The Fostex recommended horn does not work for me, simply put it does not sound right and nothing I did ever did made it sound right.
They have been to returned to the soil from whence they came.

I still think the FE103e is the better of the two drivers though, its midrange truly shines.
Maybe with more time the 108EZ would sound as good in the mids but I somehow hold little hope in that regard.

BTW, 15mm plywood is sold as 5/8th's. Almost all plywood is metric nowadays and much of it from Brazil. 13mm is sold as 1/2" etc.


Andrew
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Old 28th April 2005, 12:35 AM   #10
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Default Zigmahornet

Hi Faitour,

Here's the link I found about a Zigmahornet plan.

http://hjem.get2net.dk/sejrhede/Horn1.htm (bottom of page)

Is it faithful to what you have built?

And some guy here refered to a cabinet named "101a" what is it? just curious.

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