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Old 6th April 2003, 06:04 PM   #21
Bricolo is offline Bricolo  France
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OK, now I see what you are meaning!

You think that the back opening on my drawing is a port (I mean a round port, like on a bass reflex)

But, in fact, it's still the TL itself, the opening of the TL. You can consider it as a second fold

Do you see how the thor is build? my project is the same, the opening isn't a round port, but a rectangular opening. The back plate is simply shorter that the speaker's height
The opening height is the same as 1/5 the speaker's deepht
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Old 6th April 2003, 06:06 PM   #22
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another question: in TQWT, epsilon is the ratio between driver placement and line lenght

in offset driver, it's in in.L^-1

how do I use it? is it the number of inches it is far from the closed output? so not a ratio?
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Old 6th April 2003, 07:46 PM   #23
MJK is offline MJK  United States
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Epsilon is always a dimensionless ratio of driver position. In ML TQWT I input 0.5 because the driver is at half the length. In off-set driver I calculated epsilon by dividing the driver position by the length.

epsilon = driver position / L

epsilon = 6 inches / L = 6 inches x L^-1

There are advantages to both ways of expressing this ratio.

So in your "Thor" clone I would model the line up to midheight of the opening in the back then add a short section to get to the box inside edge and then on last section with an area equal to the opening and a length equal to the wall thickness. I think I did some thing similar for my first TL built with the Focal drivers. Take a look at the pictures in those articles.

Hope that helps,
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Old 6th April 2003, 08:42 PM   #24
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can you draw it, please?
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Old 6th April 2003, 11:36 PM   #25
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Take a look at Figure 35 in my Focal TL articles. You need to draw a picture like this except point 6 should be at the outer edge of the cabinet opening (outer most dashed line in the figure). This is the situation you want to model.

Hope that helps,
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Old 7th April 2003, 07:22 AM   #26
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Quote:
Originally posted by MJK
Take a look at Figure 35 in my Focal TL articles. You need to draw a picture like this except point 6 should be at the outer edge of the cabinet opening (outer most dashed line in the figure). This is the situation you want to model.

Hope that helps,
that's the way I want to go
except that the line will be tapered (the inner bafle won't be at 90)
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Old 7th April 2003, 11:05 AM   #27
MJK is offline MJK  United States
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So all you have to do is change the values of the areas. If you are using the offset driver or ML TQWT worksheet this is only a couple of entries. If you are using the TL Sections worksheet then you can put in areas at discrete positions along the line. I think that the TL Sections worksheet is already set-up for the Focal TL geometry shown in the figure.
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Old 7th April 2003, 07:25 PM   #28
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what is the TL sections worksheet used for?
I haven't understood it's role
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Old 7th April 2003, 07:41 PM   #29
MJK is offline MJK  United States
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The TL Sections worksheet is totally general without any "user interface" for easy input of a design geometry like the Offset Driver or ML TQWT worksheets. You have to go in and enter each section geometry by hand. It was my initial model until people started asking for simple input of certain geometries.

It is the basis for all of the other worksheets, the calculations are the same. The other worksheets fill in the individual geometries from the general simple input area on the first page. In the TL Sections worksheet you can model any geometry (folds, restrictions, sudden changes in cross-section or stuffing density, ...) that you can sketch out. It just takes time to enter all of the data for each section by hand.

That is the only difference, it is totally user input dependent.
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Old 7th April 2003, 07:45 PM   #30
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how do you add a fold?
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