Transmition Line Overview

Guss · 19th November 2003, 12:23 AM

I've been searching the net and this page for info about TL for the last few days, I read couples of article but nothing clear... What is a Tl, I mean how does it works and why is it so good when computed correctly?

I wanted to build a set of subs for my new room, a big one, at last

. I thought of 2X10'' closed each side but what if I could ''Tl'' the boxes as Im going crazy with port noise

. Actually I need a software and theory.

Sorry Dave I didn't found anything to calculate a Tl on your webpage, maybe I've missed it though...

So, what freeware and who wrote a complete resumé of TL's an related? I remember of a HUGE PDF file that was sent to me once, might talk of Tl's, maybe not but it was big

, dyou remember it, where is it !

edit: I know that Tl's are not ''modelable'' enough to include proper theory but at least you can give me the basics/advices to works with...

kneadle · 19th November 2003, 02:11 AM

Actually, with the help of Martin King, TLs are largely model-able nowadays. With that being said, the concept is still not that easy to wrap your mind around. Since you've been to Dave's site (I'm assuming you mean www.t-linespeakers.org ), you should also try Bob Brine's site and Martin King's site. Respectively, they are found here:

http://geocities.com/rbrines1/

and here:

http://www.quarter-wave.com/

Martin's site includes some download-able modelling software.

Good luck,

Dave

BAM · 19th November 2003, 05:34 AM

The learning curve on the modeling software is quite steep. I prefer the alignment tables.

kneadle · 19th November 2003, 12:46 PM

I agree with you, BAM, that the learning curve is s t e e p. But I used MJK's Mathcad worksheets to model my first TL, and I'm not very good at modelling.

I could NOT, however, have met with any success without the help of this group. I think that the thread for my project turned out to be about 30 pages of helpful points, questions, graphs and even critiques.

The moral of the story is to use the alignment tables or the Mathcad worksheets and bring all your troubles to this forum.

Dave

qi · 19th November 2003, 03:52 PM

Don't forget to look here for Jon Risch's starting guidlines...

http://www.t-linespeakers.org/design/classic.html

Guss · 19th November 2003, 09:34 PM

Quote:

Originally posted by kneadle
I think that the thread for my project turned out to be about 30 pages of helpful points, questions, graphs and even critiques.

Wheres that thread ?

thanks
Goss

kneadle · 19th November 2003, 10:10 PM

Well, since you asked

Here's the completed project:

Spiral Shaped Transmission Line Enclosure Project Complete

The first post has a link to the project while it was under construction. Keep in mind I started out with practically zero abilities in practical math and modelling.

Dave

19th November 2003, 12:23 AM	#1
Guss diyAudio Member Join Date: Jun 2003 Location: Montreal	Transmition Line Overview I've been searching the net and this page for info about TL for the last few days, I read couples of article but nothing clear... What is a Tl, I mean how does it works and why is it so good when computed correctly? I wanted to build a set of subs for my new room, a big one, at last . I thought of 2X10'' closed each side but what if I could ''Tl'' the boxes as Im going crazy with port noise . Actually I need a software and theory. Sorry Dave I didn't found anything to calculate a Tl on your webpage, maybe I've missed it though... So, what freeware and who wrote a complete resumé of TL's an related? I remember of a HUGE PDF file that was sent to me once, might talk of Tl's, maybe not but it was big , dyou remember it, where is it ! edit: I know that Tl's are not ''modelable'' enough to include proper theory but at least you can give me the basics/advices to works with...

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19th November 2003, 02:11 AM	#2
kneadle diyAudio Member Join Date: Dec 2002 Location: Buffalo, NY	Actually, with the help of Martin King, TLs are largely model-able nowadays. With that being said, the concept is still not that easy to wrap your mind around. Since you've been to Dave's site (I'm assuming you mean www.t-linespeakers.org ), you should also try Bob Brine's site and Martin King's site. Respectively, they are found here: http://geocities.com/rbrines1/ and here: http://www.quarter-wave.com/ Martin's site includes some download-able modelling software. Good luck, Dave

19th November 2003, 05:34 AM	#3
BAM diyAudio Member Join Date: Sep 2001 Location: Carmel, IN; West Lafayette, IN	The learning curve on the modeling software is quite steep. I prefer the alignment tables.

19th November 2003, 12:46 PM	#4
kneadle diyAudio Member Join Date: Dec 2002 Location: Buffalo, NY	I agree with you, BAM, that the learning curve is s t e e p. But I used MJK's Mathcad worksheets to model my first TL, and I'm not very good at modelling. I could NOT, however, have met with any success without the help of this group. I think that the thread for my project turned out to be about 30 pages of helpful points, questions, graphs and even critiques. The moral of the story is to use the alignment tables or the Mathcad worksheets and bring all your troubles to this forum. Dave

19th November 2003, 03:52 PM	#5
qi diyAudio Member Join Date: Oct 2003 Location: .	Don't forget to look here for Jon Risch's starting guidlines... http://www.t-linespeakers.org/design/classic.html

19th November 2003, 10:10 PM	#7
kneadle diyAudio Member Join Date: Dec 2002 Location: Buffalo, NY	Well, since you asked Here's the completed project: Spiral Shaped Transmission Line Enclosure Project Complete The first post has a link to the project while it was under construction. Keep in mind I started out with practically zero abilities in practical math and modelling. Dave

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