My first build - Affordable Transmission Line spiralled Loud Speaker - diyAudio
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Old 7th September 2013, 03:45 PM   #1
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Smile My first build - Affordable Transmission Line spiralled Loud Speaker

Hi Guys,
This is my first post, and my first build. Please bare with me...

I am planning to build a Transmission Line spiralled Loud Speaker. Yes, this will resemble the Nautilus, but that wasn't intentional from the offset.

The build will be made from Baltic Birch Ply segments glued together. Has anyone else tried this kind of builder before.

Attached is picture of what it should like when finished.

Speaker Design White.jpg

Also, has anyone ever put ceiling speakers in a floor standing cabinet?
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Old 7th September 2013, 05:15 PM   #2
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I thought I should upload a few more pictures of my design, would be interested in any feedback.
Attached Images
File Type: jpg 2324-Speaker housing plus speaker.jpg (248.1 KB, 1382 views)
File Type: jpg Final speaker design wireframe.jpg (601.2 KB, 1351 views)
File Type: jpg Speakers with original diagram.jpg (403.0 KB, 1280 views)
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Old 7th September 2013, 06:09 PM   #3
Mooly is offline Mooly  United Kingdom
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Welcome to diyAudio Sparrowlegs. I've moved this over to the full range forum as you won't get many replies in the intro's section.

Looks interesting
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Old 7th September 2013, 06:21 PM   #4
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Cheers Mooly
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Old 7th September 2013, 06:25 PM   #5
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Many thank Mooly
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Old 7th September 2013, 07:11 PM   #6
Mooly is offline Mooly  United Kingdom
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You are welcome.
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Old 7th September 2013, 07:39 PM   #7
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Sparrowlegs,

Is the TL quarter-wave (open terminus) or half-wave (closed)?

From your sletches i see 2 immediate issues. 1/ you are not taking advantage of driver offset to reduce the 1st undersired harmonic (less of an issue with 1/2 wave), and 2/ it is likely that your line is starting out far too small. Are you modeling this with something like MJK?

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Old 7th September 2013, 07:57 PM   #8
DrBoar is offline DrBoar  Sweden
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There is one school of TLS design were the idea is to lose all back radiation from the driver in the line. What you have is then similar to a closed box with resistive losses.This is very different from the TLS that use the quarter wave resonance to agument bass output similar to the port of a bass reflex speaker. So do clarify the type of TLS that you want to build.
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Old 7th September 2013, 07:57 PM   #9
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Hi Planet10,

This is where the fun begins. I don't know what the difference is between half and quarter wave? Looking it up now, but a brief overview would be grateful.

With regard to the driver, my design actually isn't strictly correct. Once the spiral hits 12 o'clock, the line will continue to the vertical till the driver runs flush with the belly.

Though I am not a true audiophile, I am able to construct interesting shapes.

This particular project will be made from Baltic Birch Ply.

Last edited by Sparrowlegs; 7th September 2013 at 08:09 PM. Reason: typo
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Old 7th September 2013, 08:05 PM   #10
chrisb is offline chrisb  Canada
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Notwithstanding the questions of the desirability / acoustic performance of such a design, do you have any idea as to the complexity and material yield of such a fabrication technique?

I'm not saying it shouldn't or can't be done in wood, but as a first build, it'd be a very ambitious undertaking
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