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SpicyTL - Transmission Line Simulation Model
SpicyTL - Transmission Line Simulation Model
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Old 8th January 2021, 02:08 PM   #1
slocum is offline slocum  Italy
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Default SpicyTL - Transmission Line Simulation Model

Hi everyone,

SpicyTL is online and available for download.

SpicyTL is a simulation model, based on the electrical circuit theory, which predicts the electro-acoustic behavior of transmission line loudspeaker systems. It is the evolution of the AIRDAMP model, whose development (and the principles that allow its operation) is illustrated in the article Progettare una linea di trasmissione utilizzando SPICE (Designing a Transmission Line with SPICE), published in issues 408, 409 and 410 (April, May and June 2019) of AUDIOreview. Compared to the latter, SpicyTL has a modular structure composed of several acoustic blocks and can also simulate tapered and expanding TL's.

The model, particularly suitable to design a TL damped with polyurethane foam, allows to simulate frequency response, phase response, group delay, electrical impedance, speaker cone excursion and air velocity at the TL output.

Operating instruction and download at the following address:

SpicyTL-english – Transmission Line Speakers

An in-depth look at the software, and its use for designing the Ikigai monitors, can be found in the article Progettiamo una linea di trasmissione con SpicyTL (Designing a Transmission Line with SpicyTL) on the 427th issue (January 2021) of AUDIOreview.

Kind regards,
Andrea

Last edited by slocum; 8th January 2021 at 02:28 PM.
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Old 8th January 2021, 06:49 PM   #2
weltersys is offline weltersys  United States
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Andrea,

Interesting to see a speaker simulation program that will run on the Mac OS!
Have been in “simulation withdrawal” since my PC died almost a year ago.

Will take a lot of learning to figure out how to change parameters in SpicyTL, but it looks promising.

Have you compared SpicyTL simulations to Hornresp, and if so, what areas of agreement or disagreement do you find?

I did not see a radiation angle (free space, half space, 1/4, 1/8 space) parameter, which is assumed in the SpicyTL simulation?

Thanks,
Art
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Old 9th January 2021, 04:21 PM   #3
slocum is offline slocum  Italy
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Hi Art,

I just made a simulation with the default driver of Hornresp and it seems that the results match very well.

The simulation is on a half-space (default setting of SpicyTL), empty line and losses set to zero.

Andrea
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Old 9th January 2021, 05:54 PM   #4
weltersys is offline weltersys  United States
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Good to know, thanks!
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Old 10th January 2021, 07:03 PM   #5
dkjosness is offline dkjosness  United States
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I've been eagerly awaiting the publication of SpicyTL and looking forward to giving it a try.


Thank you, Andrea!
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Old 10th January 2021, 07:38 PM   #6
planet10 is online now planet10  Canada
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SpicyTL - Transmission Line Simulation Model
On a Mac great. I have LT-spice downloades but get nowhere downloading the spicyTL file (i get something called “SpicyTL.zip.html” which is not a vaild html or zip file [21k]).

What is the likelihood that models for better damping than foam (who's only asset is consistency?

dave
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Old 10th January 2021, 08:18 PM   #7
slocum is offline slocum  Italy
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Hi Dave,

you must have tried just when I was uploading an updated version of SpicyTL (ver. 1.2)

These days I'm testing the program intensively and I found two small bugs.

I'm not sure I understand your question.

Andrea
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Old 11th January 2021, 12:57 PM   #8
slocum is offline slocum  Italy
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Quote:
Originally Posted by dkjosness View Post
I've been eagerly awaiting the publication of SpicyTL and looking forward to giving it a try.


Thank you, Andrea!
Thank you, I await your impressions

Andrea
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Old 11th January 2021, 04:35 PM   #9
planet10 is online now planet10  Canada
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SpicyTL - Transmission Line Simulation Model
Quote:
Originally Posted by slocum View Post
I'm not sure I understand your question.
Thanx Andrea,

Do you plan on adding materials other than foam since it is not great at damping) with better damping materials?

dave
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Old 11th January 2021, 08:09 PM   #10
slocum is offline slocum  Italy
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Hi Dave,

thanks, it's clearer now.

I have developed some models that predict very well the behavior of fibrous materials, especially Dacron, but I have not yet included them in SpicyTL. Actually also in SpicyTL there is a block (straight_fiber) that can simulate a straight line filled with fiber by defining the percentage of filling, but it is a somewhat limited tool within an elaborate design.

The main reason I focused on foam is that I firmly believe it is the best material to use for TL dampening.
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