Crossover frequency for transmission line
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 Multi-Way Conventional loudspeakers with crossovers

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 16th April 2018, 10:54 PM #31 Cliveinuk   diyAudio Member   Join Date: Nov 2017 Paul , I'm not concerned ! I guess I'm just ignorant
pkitt
diyAudio Member

Join Date: Feb 2009
Frankly, designing a line with its area sized as a percentage of Sd has no real meaning, and certainly not a requirement. Assuming you have decent modeling software, like Martin King's, I just start out with a line width equal to or slightly greater than the driver's flange diameter, and often an arbitrary line depth, start usually with a taper of 10:1, which then sets the line's area dimensions at the other end, the same width and 1/10 of the depth. But, before I start all that, I calculate the line's required length based on its desired 1/4-wavelength resonant frequency as if the line will not be tapered, then multiply that length by 0.6 to determine the length of the 10:1 tapered line. All of these dimensions, line length, width, etc, can be manipulated during modeling to achieve the desired results.
Paul

Quote:
 Originally Posted by Cliveinuk Paul what is a taper ratio of 24:1 Can you rather put it as a percentage of the Sd at the start of the line and a percentage of the Sd at the end of the line

pkitt
diyAudio Member

Join Date: Feb 2009
As you are now aware, Dave's drawing in Post #24 illustrates quite nicely what I modeled, but you would build it folded once for practicality.
Paul

Quote:
 Originally Posted by Cliveinuk Paul, when you say the woofer centre is 16 inches from the beiginning of the line do you mean there is a box that is 16 inches long and does not count as part of the line length here is a question ? does the baffle step diffraction get influenced by the material used in the baffle So for instance 12mm mdf vs 25 mm concrete as extreme examples Will the concrete exibit this to a much lower extent? Speaker design is not as simple as ABC then thanks again to everyone for the effort in replying Clive

Cliveinuk
diyAudio Member

Join Date: Nov 2017
my buttons above the text box are
remove text formatting , bold , italics , underscore , colour , insert link , insert image ( which pops up a box asking for URL only) and wrap

Oh got it now go advanced does the trick !!!!

Quote:
 The taper is aggressive, but that makes it more compact. Paul is well known for his heavily tapered lines. Since the advent of proper TL-modelers, an end-loaded driver is rarely seen
so that does it then the shape is settled now I just have to work out how to wrap this TL around around a concrete molded mid-range either it will look really sexy or damn ugly

I like the idea of concrete about 5 months ago I drew this up as an idea to mold speakers in concrete , Now this is what I called sexxxxy but I wont argue with anyone who insists on ugly
Attached Images
 IMG_1087.jpg (533.1 KB, 36 views) IMG_1433.jpg (757.6 KB, 34 views)

planet10
frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Quote:
 Originally Posted by pkitt ...but you would build it folded once for practicality.
As i mentioned as well. Here is a 1st pass folding added. Do note that i rationalized the dimensions to metric and this drawn with 18mm material.

Given the large size of the midrange, i would mount it on top with the tweeter below (if one rotates the top of the TL by 30° or so, one can reduce the mounted height of the tweeter & midrange)

dave
Attached Images
 PKitt-Morel-UW-1058-TL-t2.png (13.3 KB, 74 views)
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 16th April 2018, 11:26 PM #36 Cliveinuk   diyAudio Member   Join Date: Nov 2017 just to confirm the above drawings are an old idea I will try to make a midrange out of concrete but wrap the TL around it
 16th April 2018, 11:29 PM #37 Cliveinuk   diyAudio Member   Join Date: Nov 2017 Does the end of the line have to point in the same direction as the driver or is it not an issue I see most of the examples I have seen point forward
 16th April 2018, 11:34 PM #38 planet10   frugal-phile(tm) diyAudio Moderator     Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III At the frequencies involved there is no “driver facing” position. Th event proximity to a boundary can have some effect. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA
 16th April 2018, 11:59 PM #39 Cliveinuk   diyAudio Member   Join Date: Nov 2017 Paul , Dave with a sealed enclosure the idea is to try and get rounded corners , no parallel sides etc does the same apply here ?
 17th April 2018, 12:14 AM #40 planet10   frugal-phile(tm) diyAudio Moderator     Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III At the frequencies involved even a rectangular box look slike a sphere to the LF driver. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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