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3D printed waveguides

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  • Wolf
    replied
    I'll add you to my list, Ed. It;s about 7 weeks out...
    Wolf

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  • edlafontaine
    replied
    Originally posted by PWR RYD View Post
    Hi Ed. Are you gonna be able to make it up to InDIYana this year?
    Hi, I am planning to. It has been awhile.

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  • PWR RYD
    replied
    Hi Ed. Are you gonna be able to make it up to InDIYana this year?

    Leave a comment:


  • edlafontaine
    replied
    The surface of the faceplate which corresponds to the surround is also curved. The air gap between the 2 increases from the adhered edge toward the dome.
    Attached Files

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  • edlafontaine
    replied
    The CSS LD25X
    fwiw

    The surround has an irregular profile. The surround of this tweeter is half occluded by the waveguide. That portion which is covered by the guide is curved. That portion which is not covered by the guide is "flat" to the dome.
    This tweeter was plagued by quality and consistency issues and was not a commercial success. Among the select provided for testing it has what was characterized as "world class" low distortion.
    Attached Files

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  • ernperkins
    replied
    Three areas of change popped into my head. Of course they all depend on the depth and width of the waveguide.
    1. It changes (reduces) the acoustic offset by moving the tweeter back. This will change the phase relationship between the drivers, especially at the crossover point. Many designs use an asymmetrical crossover (e.g. 2nd order electrical on woofer and 3rd order electrical on tweeter) to compensate for the acoustic offset. Depending on the waveguide depth the tweeter crossover might need to be changed to 2nd order electrical since the acoustic offset has been reduced.
    2. Depending on the waveguide (mainly width) you’ll see a boost in the tweeter’s lower response. That’s a good effect since the tweeter’s output can be reduced more (lowering distortion) to match the other drivers. But it will require crossover re-work. A potential benefit (again depending on the waveguide) is that you may be able to crossover at a lower frequency.
    3. The waveguide will add controlled directivity which effects power response. If you use averaged listening window measurements you’ll see the change and may want to account for it.

    In a nutshell: I would take all new tweeter measurements and use those with the current crossover to see the magnitude of the change.

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  • edlafontaine
    replied
    If this is not related to the thread...
    For a flush-mount speaker design, what changes to the crossover would you consider making to correspond to placing the tweeter in a waveguide?

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  • andy19191
    replied
    Originally posted by augerpro View Post
    Let my subscription lapse while I'm travelling for work, but I renewed it just now. Site should be back in 48 hours. The SB26 versions are the most popular.
    Thanks. I will download it when the site comes back up.

    Originally posted by augerpro View Post
    Why are you developing your own software? Does something like ABEC not work well for you?
    It is possibly a semi-retirement project otherwise a hobby interest. Depends how it goes. The BEM work is somewhat to the side of the main project but it has been on the to-do list for 20 years over which time I have made a couple of starts. The last long weekend a few months ago produced a very rough but apparently working hack using higher order quad elements (i.e. curved geometry and fewer required elements per wavelength for accuracy). It is this that I intend to tidy up soon, run some basic testing and then demonstrate with a few examples like one of your waveguides. Later developments which are not imminent would be to add a fast mulitipole method to increase efficiency for room simulations and later to adjust the geometry parameters to best fit a target directivity (hence the interest in the parameters you use) much of the software for which will likely arise anyway from some of the work required for the main project.

    I have never used ABEC but intend to give it a quick go at some point. I don't use windows, ABEC has crippled IO in the free version and I cannot afford the full version making it of limited interest. I have tried elmer which proved to be broken and judged not worth fixing. I have also tried acousto which worked OK but was clumsy and used zero order elements (as does ABEC) requiring fine grids for accuracy which hurts methods like BEM which use full matrices.

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  • augerpro
    replied
    Let my subscription lapse while I'm travelling for work, but I renewed it just now. Site should be back in 48 hours. The SB26 versions are the most popular. Why are you developing your own software? Does something like ABEC not work well for you?

    Leave a comment:


  • andy19191
    replied
    I am seeing advertising on somasonus.net like a no longer registered site. Is this a problem at my end or yours?

    After years of prevarication it looks like I am finally getting round to developing some software suitable for waveguide simulation and would like to use one/some of your builds as an example. Which would you consider the most popular/suitable and how do you parameterise the geometry?

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  • augerpro
    replied
    I did test the SB19, should be in my earliest results. The SB21 was better - at least with the designs I was doing at the time - and with a shorting ring seemed a better choice so I didn't pursue the SB19 any farther.

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  • TN Allen
    replied
    If someone is sufficiently interested in testing this tweeter, the SB19ST, and has an interesting wg design and ideas for comprehensively testing it, I might mill or print the design.

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  • DaveFred
    replied
    Did you ever try a waveguide with the SB19ST?

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  • civit
    replied
    Originally posted by augerpro View Post
    Sorry for the absence, working a ton the last few months. But the good news is I've started a new website somasonus.net to host all my DIY stuff. It's barren right now, but I have posted the best of the waveguides with downloadable CAD files for 3D printing or CNC. Let me know if anything renders weird on the website, it really changes depending on what device I'm on.
    I think I emailed you about this a week or two back. Thanks for doing this.

    Leave a comment:


  • dlneubec
    replied
    Very cool. Kudos for what you are doing for the DIY community.

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