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Old 3rd November 2009, 02:28 AM   #1
MPM is offline MPM  United States
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Default fostex based mini line array

Anybody have any information on the fostex mini line array in the picture? I'm guessing they are fe107e or fe127e. Cabinet design, how they potentially sound, what amps sound good thru them, etc....... I know they aren't really line arrays, just lack of proper name at this time.


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Old 3rd November 2009, 10:19 AM   #2
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Hmm........... I've no clue what they are........Looks like a mltl. Maybe the top and bottom driver are rolled off for baffle step....

I like what the designer is trying to do, getting more volume and less distortion from his favorite driver. Problem is above and below the array there will be no highs. And I'm guessing even at exactly the middle of the array 10' back you would be mising some highs.

Norman
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Old 3rd November 2009, 01:58 PM   #3
MPM is offline MPM  United States
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Thanks norman. I'm just interested in some possible replacements for my HT main speakers. I've always been a big fan of the seventh veil type speaker or short line array so those fostex based quads caught my eye. They would do double duty as my HT/music speakers. I suspect they would work pretty good in my HT setup since I cross around 100Hz to the sub. Usually listen at moderate levels. A matching center channel could be made with these plans.

https://www.madisound.com/pdf/fostex...7e_revencl.pdf

I guess I could take the dimensions from the plans and reverse engineer something for the mains that would place the speakers closer to each other but the tuning would need some work since there is a dedicated sub. Surrounds would be easy enough with a single driver.

These are just thoughts as I know there is usually a better option according to most people.

Last edited by MPM; 3rd November 2009 at 02:06 PM.
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Old 3rd November 2009, 07:22 PM   #4
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I use a dual tang band 4" bamboo in a vert stack, looking like this.
Both run wide open using loudness button to compensate for baffle step.
http://www.armonia-avm.com/omega/mod...ga-minuete.jpg

I have to level it with pennies as if you stoop down, some highs go away (12').
It is a pain but works for me and anyone else at the same vert height.

4 drivers with a 5" frame would be disaster I think.
The 7th veil used bandors which I though were 2.5" frame.
You could use the tang band w2-803sm but they are $16 each and only have 13cm2 area. It takes 4 of those to equal the area of 1 TB bamboo 4". I've been thinking of using the TB but I have a bunch of the peerless 830970 to try in a 4 stack first.

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Old 3rd November 2009, 11:30 PM   #5
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The bandor 50mm has a cone area of 26cm2, double that of the 2" tang bands. The tang bands have high f3's in sealed boxes due to qts and their f3 compared to the bandors.

A couple of people have run 4 of the audience A3 drivers (32cm2) with good results (ouch, pricy). Their rising response helps compensate for loss of highs from cancellation/smearing/combing. The A3 has an 8db spike near 8khz.

http://www.audience-av.com/parts/spe...StatsGraph.pdf
Audience

There is a pair of A3's on the swap meet forum for $240 with free shipping, no offers since 1st November.

I've read the w2-800sl works well (japanese comments), but the qts of .25 with Fs of 160, means a qtc .707 would have an f3 of 452hz (yikes).

Norman
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Old 4th November 2009, 03:28 AM   #6
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Given that people like the 4 x Audience a3 vertical mini array, you can use 4 of the same frame size (84mm). Ignoring build quality, xmax, freq responses, and sound differences, lower cost alternatives are ..............


Fostex Fe87e
TB W3-593sf
Tc9
Tg9

I'd go for the tc9, especially as the other tc9 in no longer availiable and 10+ is $11.61 each right now.
Vifa TC9FD18-08, 3.5" Full Range from Madisound

Norman
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Old 4th November 2009, 03:32 AM   #7
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Quote:
Originally Posted by norman bates View Post
Fostex Fe87e
TB W3-593sf
Tc9
Tg9
i've sent plans to Chris for a prototype box using 2 x FF85KeN. If that turns out well, we'll probably try 4.

Inspired by the Audience and by Floyd Toole's discussion of how comb filtering looks bad in a graph, but the brain is expecting it.

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Old 4th November 2009, 07:48 AM   #8
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Could be interesting.

BTW, I suspect the box above is either one of the slightly odd DBR variations the Japanese seem to like, or a Weems style pipe / ML conical horn.
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Old 4th November 2009, 08:51 AM   #9
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Dave, I'm sure it will be good, specially with bass support. I tried baffle stepping and covering 1 of my dual driver setup but preferred both drivers with baffle step eq.

Scott, That dbr seems to have so many benefits for cone motion reduction (always a plus for us full rangers !!!). I'd imagine that phase change so high in freq is audible though. I remember the badly done one in the zu druid in soundstage.com sept 2002, terrible ............
SoundStage! Measurements - Zu Cable Druid Loudspeakers (9/2002)



I think I'll make a sexy 4 x b3s vertical flat array. Should work well with zaph's notch.

Norman
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Old 4th November 2009, 07:55 PM   #10
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I just want to comment on how much fun that room has in it. I'd have a field day in there.
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