How to use Martin J. King's software to design a TL loudspeaker? - Page 3 - diyAudio
 How to use Martin J. King's software to design a TL loudspeaker?
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 6th April 2003, 06:04 PM #21 diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR 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
 6th April 2003, 06:06 PM #22 diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR 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?
 6th April 2003, 07:46 PM #23 Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY 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,
 6th April 2003, 08:42 PM #24 diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR can you draw it, please?
 6th April 2003, 11:36 PM #25 Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY 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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Join Date: Nov 2002
Location: Grenoble, FR
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°)

 7th April 2003, 11:05 AM #27 Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY 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.
 7th April 2003, 07:25 PM #28 diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR what is the TL sections worksheet used for? I haven't understood it's role
 7th April 2003, 07:41 PM #29 Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY 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.
 7th April 2003, 07:45 PM #30 diyAudio Member     Join Date: Nov 2002 Location: Grenoble, FR how do you add a fold?

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