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Old 10th February 2012, 11:43 PM   #1
cross reference is offline cross reference  United States
diyAudio Member
Join Date: Jun 2011
Location: Canton Michigan
Default Looking for free (T.L.) software? Need help.

Hello all I am looking to use some (T.L.) software. I want to build a pair of speakers for a friend as a gift and to see if I can really do this right. I need info on how to calculate the drivers (t/s) then it will tell me how big the box needs to be and so on. I do not know if (M.j.) website is still letting you buy the work sheets? I thought I read some were in post were he was not doing that any more but, I could have read it wrong. I am trying to do this as cheap as I can. Thanks jd
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Old 11th February 2012, 01:30 AM   #2
rjbond3rd is offline rjbond3rd
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Join Date: Jan 2007
Since you mention free, MJK has a free and very straightforward option is here: Transmission Line Theory

Click on "Alignment Tables Spreadsheet"
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Old 11th February 2012, 07:52 AM   #3
bAD kLOPFER is offline bAD kLOPFER  Germany
diyAudio Member
Join Date: Aug 2011
Location: Germany
You can also simulate TLs via "Hornresp" or "AkAbak". Both are free to use but not self explaining (the MJK sheets aren't self explaining either). They may not be specialized as the MJK sheets are but the results won't differ so much.
I attached three pictures of Hornresp of my TABAQ simulation. It is not perfect but it shows the idea (driver placement, etc.). And you can look at the "real world results" here.
Attached Images
File Type: jpg Hornresp_Input.jpg (83.7 KB, 143 views)
File Type: jpg Hornresp_SPL_Response.jpg (68.2 KB, 143 views)
File Type: jpg Hornresp_Schematic.jpg (45.3 KB, 142 views)

Last edited by bAD kLOPFER; 11th February 2012 at 08:09 AM.
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Old 12th February 2012, 06:29 PM   #4
krakatoa is offline krakatoa  Romania
diyAudio Member
Join Date: Feb 2007
Location: Cluj-Napoca
Hornresp is a free tool to model transmission lines and other types of enclosures.

To model a TL set Vrc,Lrc, Ap, Lpt, Vtc, Atc (there all together in the lower part of the screen) to zero. You can simulate driver position with tools - driver arrangement - offset driver. To save time (about 50 times faster) go to tools - loudspeaker wizard. The last thing you need to know about is the "combined response" function which enables you to see the response graph of the system, not just the pipe output; you can find it in loudspeaker wizard or in the SPL response window - tools - combined response, just click ok (leave zero the path length distance).

You can model all kinds of TL - tapered, simple tube or expanding tube. Just play with the S values.
If you are planning to use stuffing in the TL - Hornresp doesn't do stuffings, so you might wanna add some volume to increase pipe output at the main resonance to compensate for the stuffing otherwise F3 will be higher then simulated (the stuffing "eats" from the pipe output) .
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