ML TQWT for Fostex FE167e

[planet10]

Originally posted by Raphael Shaw
-why is it important that the two holes behind the driver are symmetrically positioned?
-and based on that reasoning, surely it's equally important that the angle just below the magnet is mirrored above it?

It isn't important that it is symetrical. The 2 big holes are there to open up as much space as possible (with as little work as possible) and still retain a mechanical path directly from the back of the driver to the back of the box. This last is one of the suble design touches that i should be more explicit about...

dave

[Raphael Shaw]

Originally posted by Raphael Shaw

- I am very interested in the EnABL process, I have been reading some good threads on it and it sounds very cool. I will carry on reading. In the mean-time, I'm going to practice EnABL'ing some cheap drivers that I have which have a similar size & shape paper cone to the the FE167e. I will let you all know how it goes.

I have made this simple Excel calculator for making EnABL pattern stencils. It calculates the angle of a flat disc which would make a cone of a desired pitch, using easily measurable dimensions.

BudP must have used something similar here:

Here is a sample cone you can cut out and make into a cone, either an innie or an outie. As you can see the block size in a ring set changes with the actual diameter that it must cover. The lisp program that I have performs all of these calculations and draws the resultant conic section as a flat surface. I have converted it ot a jpeg format for your convenience The specifications need to be for: The large cone opening diameter, or the diameter just at the lowest edge of the surround where it overlaps the cone. The small cone opening diameter, or where the center dome actually touches the cone surface. The material thickness, a guess will do. The length down the cone surface from the surround lower edge to the top edge of dome attachment, on the cone.

EnABL Processes

I hope it's usefull. Perhaps it could be added to the EnABL-Process thread???


*! -Oops, I can't attach an excel spredsheet.
I'll find somewhwere to post it, and add a link.

-or just ask, and I'll mail it to you.

Here is a screenshot, so you can get an Idea...

[Raphael Shaw]

OK

here it is zipped.

[Raphael Shaw]

Ok, so down at the tip of Africa, I've been asured that Fostex no longer do the 167, and that the 166 is exactly the same.
-Sounds fishy to me, but there you have it.
So, after a 90 day import period, to only supplier in Cape Town, has 166s for me, instead of the 167s I ordered.
Is there perhaps a small mod I could do to the Deitri boxes I've nearly completed, which will make them '166 ready'?
-How major are the diferences?

[planet10]

Originally posted by Raphael Shaw
Ok, so down at the tip of Africa, I've been asured that Fostex no longer do the 167, and that the 166 is exactly the same.

He is full of it. 166 may look the same from the front, but it is not the same driver at all -- i'd guess they didn't pay enuff attention and ordered the wrong driver and are now trying to stick you with their mistake ... you may be able to make it work by adding series resistance.

(I just recently received 21 FE167...)

So, after a 90 day import period, to only supplier in Cape Town, has 166s for me, instead of the 167s I ordered.

I'd be very tempted to get your money back and get a stock set from Madisound (make sure they check that the whizzers are on straight before they send them overseas). Depends on how willing you are to wait vrs how much you want to compromise all the work you've done.

http://www.madisound.com/catalog/pro...roducts_id=271

How major are the diferences?

The FE166 really wants to be in a horn. Differences are substantial.

dave

[Raphael Shaw]

Originally posted by planet10


He is full of it. 166 may look the same from the front, but it is not the same driver at all -- i'd guess they didn't pay enuff attention and ordered the wrong driver and are now trying to stick you with their mistake

...

Differences are substantial.

-Thought so.

Thanks a lot for the response. I'll do what I can to source the 167s.