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Old 20th November 2012, 09:02 AM   #1
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Default First build

Hi,

My first build and post on this forum.

Been reading a lot on this forum but can't som some answers becuase there is just too much information.

I'm looking for a full range speaker with high sensitivity since I'll be using a tube amplifier (2x10W). I listen to all sorts of music and will probably need to place the speakers in a corner.

I've been looking at the Curvy Chang for my first build, is this a good choice with my conditions?

Cant seem to find anywhere to buy the Fostex FE207e elements. Is there a replacement element I can use?
I also haven't been able to find any prints for the Curvy Changs?

Thanks in advance for any help!
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Old 20th November 2012, 11:01 AM   #2
zman01 is offline zman01  Bangladesh
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Tortensson,

AFAIK the Fostex FE207E has been discontinued by Fostex. IIRC the plans for the Curvy Chang has gone into the archives as the driver is no longer available.

One of the easier builds with a larger (6.5") and reasonably sensitive (92 dB) FR driver is the Pensil 12P - you can look it up in the forums. The driver for that particular build is the Mark Audio Alpair 12P.
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Old 20th November 2012, 03:32 PM   #3
chrisb is offline chrisb  Canada
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Zia is correct as far as he goes - if you're still interested in a 200mm class Fostex driver the new FF225WK would be closest to a replacement for 207E, with the following caveats:

Like the 207E, most folks would find they need a tweeter, at a minimum probably something like the FT17H, which brings the per enclosure cost of drivers to within a few dollars of the cost of the A12Ps


While all the new WK series I've seen so far use the same basket/frame size tooling as their predecessors (stamping jigs long since amortized to $0 ? ), none should be considered "direct dop-ins" - their T/S parameters have changed significantly enough that properly designing enclosures for them needs a clean sheet of paper.

Since the OP expressed interest in a Chang family enclosure, it should be said that in the intervening years the designer (Scott L) has evolved quite a few very interesting designs for Fostex , Mark Audio and a variety of other driver brands.

When choosing or recommending any speaker system (driver +enclosure), I always like to consider the room size as well as the other factors you mentioned - if they'll need to be placed in corners does that imply a smallish room? If so, you might well be served with a smaller driver than an 8", with the resulting benefits of smaller enclosures as well as possibly avoiding the need for tweeters. The Fostex candidates would be FE166EN for a BLH type ( Victor) , or FF165WK for something like an MLTL.

The Alpair12P is a helluva nice driver - so far I've heard them in a medium sized stand mounter, as well as Scott's SuperPensil, and I'm sure there has been at least one build of Avebury for them - due to WAF factor, that's one I probably wouldn't really want to hear
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Old 21st November 2012, 09:47 AM   #4
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Thanks for the replies, much appreciated!

The room is about 4m x 7m.

I don't mind using a tweeter as well, guessing I'll being needing some sort of crossover filter as well then.
As long as have a blue-print for the crossover i wouldn't mind building it.

Since it's a living room I will be needing quite high waf factor.
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Old 21st November 2012, 12:23 PM   #5
zman01 is offline zman01  Bangladesh
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Torstensson,

Forgot to mention, Welcome to diyAudio!

Attached some pics of the Pensil 12 (made with previous gen metal cone A12) and Pensil 10.2 for your reference - you can test the WAF with these.
Attached Images
File Type: jpg Lux_pencil12.jpg (55.1 KB, 263 views)
File Type: jpg _DSC4704_frame.jpg (46.9 KB, 260 views)
File Type: jpg P1040483.JPG (74.8 KB, 259 views)
File Type: jpg birch-4.jpg (45.1 KB, 259 views)
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Old 21st November 2012, 12:50 PM   #6
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Thanks!
They sure look nice.

Is there any place a can find a print for Pensil 12 with a complementing tweeter and crossover print?
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Old 21st November 2012, 06:11 PM   #7
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Torstensson View Post
Thanks!
They sure look nice.

Is there any place a can find a print for Pensil 12 with a complementing tweeter and crossover print?


I'd suggest you might not need a tweeter with the 12P, and almost definitely not with the smaller Alpairs - most notably the 7.3, which would be my first suggestion for a room your size. The 2 enclosure designs for this driver that come immediately to mind for your application would be the Pensil or FH3.

But if you do decide that a tweeter would be required with the 12P, the Pensil enclosure for same is plenty large enough to fit virtually any candidate, and a simple 1st order HP filter the region of 10-12 K would be my initial starting point
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Old 21st November 2012, 06:49 PM   #8
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Quote:
Originally Posted by chrisb View Post
...or FH3.
When corners & small tube amp came up (2x10w is really not that small), i thout FH3 with FE126eN

dave
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Old 21st November 2012, 07:06 PM   #9
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by planet10 View Post
When corners & small tube amp came up (2x10w is really not that small), i thout FH3 with FE126eN

dave

certainly now that we have a better idea of room size, and considering the original post inquired re Fostex driver, that's probably a good suggestion
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Old 22nd November 2012, 08:03 AM   #10
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Thanks guys!

I can pick up a FE126eN locally which is nice. With the FH3, do you mean the Frugal Horn mk3 (http://www.frugal-horn.com/fh3-plans.html)?

I actually have a bit more budget then the cost for the materials of the FH3 and the FE126eN, is there a element with better specs that would be better or should I just spend the extra to increase the waf-factor?
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