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Designing a horn-loaded sub-woofer

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  • Designing a horn-loaded sub-woofer

    I'm to a point in my travels where I would like to know how to design and build a folded horn sub-woofer. I know there are plans that can be purchased, but I cannot find much information on how to actually design an enclosure. I downloaded a program called Hornsrep I believe it is called, but it makes no sense to me. I entered my parameters for the driver, but beyond that I am lost.

    Note that this is merely me trying to educate myself on another chapter of speaker DIY. I'm not out to take anyone's thunder or steal anyone's ideas. It has taken me some time to learn the ropes of direct radiating enclosures, but horns are so complex that they really intrigue my interest and my mind. If you would like to partake with me I would appreciate the help.

    Thanks,
    Chris
    "I don't know everything and do not claim to. I continue to learn and that is what makes me human."

  • #2
    Start with the basic modeling of a FLH (front loaded horn: driver in a sealed box, fires directly, axially, into a horn in front of the cone):

    http://redspade-audio.blogspot.com/2...orn-basic.html

    Eventually, you want to read this whole thread (the horn stuff begins with post 7 or 8 I think):

    https://www.hometheatershack.com/for...-everyone.html


    I warn you though, once you become somewhat familiar with modeling them with Horn Response, you'll want to learn Akabak, which I have to say, is pretty dang awesome.

    The only thing you'll have to loosen up on is the idea of it being an ULF subwoofer unless you give up massive amounts of space. You are still bound by Hoffman's Iron law. A short path-length horn with a small mouth opening will not have deep bass that is ultra-loud. If you want extension below 50Hz, you'll have to get creative and really determine the compromises you will be willing to make: longer horns are more complex to build, and larger mouths will create for a physically huge horn.

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    • #3
      Thank you for the help. Do you they make a solid textbook or manual on this? I find it strange that info for this is so difficult to find.
      "I don't know everything and do not claim to. I continue to learn and that is what makes me human."

      Comment


      • #4
        I doubt it. I'm sure you could find references in some books here and there. What you would need to look for are AES "white papers" on search engines, especially the ones that cite the "Webster's Horn Equation" in the works cited/references, then look up everything in those references to see where they point,. and once you find those, you keep looking to see where the new publications cite as references until you eventually come back to home base. There's your book.

        You could start here.
        http://www.audiostereo.pl/index.php?...tach_id=194802

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        • #5
          There are some guides on on several other sites. https://www.hometheatershack.com/for...-everyone.html
          The problem is typically folding up the 5 meter long horn
          John H

          Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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          • #6
            The Help file for Hornresp is fairly good and not too dense - you can read it in less than an afternoon, and it is a good reference at other times.
            Technology in the service of art, for the life of the music.

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            • #7
              Originally posted by STIchris722 View Post
              Thank you for the help. Do you they make a solid textbook or manual on this? I find it strange that info for this is so difficult to find.
              It's a massive undertaking. The horn mouth will have to be huge for those wavelengths, so almost certainly you're talking a corner horn. And as mentioned above, you'll need to fold 5 meters (or more) of horn length. All in all, most people just opt for multiple subs.
              Francis

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              • #8
                People over at AVSforum have made some big ones. You could check those threads out for practical stuff like how to actually build one after you design it.

                Comment


                • #9
                  Originally posted by fpitas View Post

                  It's a massive undertaking. The horn mouth will have to be huge for those wavelengths, so almost certainly you're talking a corner horn. And as mentioned above, you'll need to fold 5 meters (or more) of horn length. All in all, most people just opt for multiple subs.
                  This is one of the reasons they're not too home-use friendly---they take up a to of space and you need to run multiple units to smooth out the ripple in the frequency response. Much easier to get loud with multiple smaller subs and with tons of amplifier power that is available now a days.

                  Comment


                  • #10
                    Originally posted by STIchris722 View Post
                    .... I downloaded a program called Hornsrep I believe it is called, but it makes no sense to me....
                    Chris
                    Look for LilMike's stuff -
                    https://www.avsforum.com/forum/155-d...-hornresp.html

                    "Not a Speaker Designer - Not even on the Internet"
                    “Pride is your greatest enemy, humility is your greatest friend.”
                    "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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                    • #11
                      This page has some tapped horns, you may find that interesting.

                      Projects – Volvotreter Homepage

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                      • #12
                        check out the papers by Keele, can start here:
                        http://xlrtechs.com/dbkeele.com/PDF/...TS%20Paras.pdf

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                        • #13
                          Originally posted by Vega-Man View Post
                          check out the papers by Keele, can start here:
                          http://xlrtechs.com/dbkeele.com/PDF/...TS%20Paras.pdf
                          That's a really good white paper!

                          Comment


                          • #14
                            Originally posted by Vega-Man View Post
                            check out the papers by Keele, can start here:
                            http://xlrtechs.com/dbkeele.com/PDF/...TS%20Paras.pdf
                            Great start. The only part it's leaving out is the part I cannot figure out: the exponential expansion of the horn and horn length. I am struggling like heck to find this information out. I'm very good at math, but I cannot find the information to calculate this. It's like the people that accidentally figured this stuff out aren't sharing the information. I can't blame them though!
                            "I don't know everything and do not claim to. I continue to learn and that is what makes me human."

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                            • #15
                              See these for a more detailed discussion of the horn flare:
                              https://www.grc.com/acoustics/an-int...orn-theory.pdf
                              http://www.audioxpress.com/assets/up...olbrek2885.pdf


                              "Not a Speaker Designer - Not even on the Internet"
                              “Pride is your greatest enemy, humility is your greatest friend.”
                              "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

                              Comment

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