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Thread: Foam wrap on midrange horn

  1. #1
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    Foam wrap on midrange horn

    Seems I saw a reference somewhere to wrapping horns with sound deadening foam. Is that a valid tweak or the emperor's new clothes?

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    Dr. Geddes has a patent. Here is some info from a guy who has done it: http://www.enjoythemusic.com/diy/111...waveguides.htm

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    Senior Member grumpy's Avatar
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    Wrapping, stuffing, or edging ... they're all addressing slightly different issues,
    although the last two are similar.

    What example of "wrapping" might illuminate your question further?
    Mass loaded paint or putty or tar can move a resonant point and/or
    reduce it's "Q", as can simply mounting the horn to a baffle.

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    el goregrind es cultura

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    Senior Member pos's Avatar
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    Quote Originally Posted by Flaesh View Post
    not foam but wrapping:
    Name:  9022fa551072.jpg
Views: 490
Size:  172.0 KB


    Here is the 4-way version :
    Name:  arbre-a-chats-masdessaules.jpg
Views: 545
Size:  134.9 KB

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    Klipsch tweekers have done it for years using various and sundry types of rope caulk

    As many variables are involved, I would think the degree of improvement would be commensurate with the amount of "ringing" or other unwanted behavior one was experiencing with the given horn related to spurious resonances as well as the overall size of the horn, it's construction material and the job it was being asked to do

    In other words, a try it and see what happens type of thing

    If you experiment with it, just do it in a fashion that is easily reversible

    Clearly, there is some legitimate application for this (and reasons), witness the "tar filled" horns of ALTEC and many others during the "Golden Age"

    I have tried it myself with the Klipsch "squawker" horns in several boxes back in the early 2000s; the results were negligible to my ears after being tempted with promises of great changes for the better

    For smallish mid and high frequency applications I am skeptical (co-axials being the exception as the little horn sits right in the middle of an ocean of low frequency energy)

    Still think it's degree of efficacy would be best determined on a case by case basis

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    +20 dBWaf. Make shure it is synthetic

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    Quote Originally Posted by grumpy View Post
    Wrapping, stuffing, or edging ... they're all addressing slightly different issues,
    although the last two are similar.

    What example of "wrapping" might illuminate your question further?
    Mass loaded paint or putty or tar can move a resonant point and/or
    reduce it's "Q", as can simply mounting the horn to a baffle.
    I agree and was about to say and cite the horn to baffle "interface" could have as much of an impact if not more
    The use of a gasket there for example, as well as the rear support (if any) of the entire driver/horn assembly can and does impact tuning and resonance

  9. #9
    Member Flaesh's Avatar
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    Quote Originally Posted by more10 View Post
    .. Make shure it is synthetic
    Do you support\advise usage of genuine natural foam for horn wrapping?..

    Bear genuine fur can be more patriotic or longer rose hair can be more glamour..
    I'm not personally acquainted with the author of this system and can not manipulate the wrapping..
    el goregrind es cultura

  10. #10
    Member Flaesh's Avatar
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    Quote Originally Posted by pos View Post
    Here is the 4-way version :
    Cats are usable for damping at the bottom of backload horns in lower Cessaro models in Hong Kong..
    p.s.: Link to pics is dead . Cats where installed in Cessaro Alphas.
    el goregrind es cultura

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    Quote Originally Posted by grumpy View Post
    Wrapping, stuffing, or edging ... they're all addressing slightly different issues,
    although the last two are similar.

    What example of "wrapping" might illuminate your question further?
    Mass loaded paint or putty or tar can move a resonant point and/or
    reduce it's "Q", as can simply mounting the horn to a baffle.
    Specifically would it be of value to wrap an Le85?

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    Quote Originally Posted by Bluegrassmaven View Post
    Specifically would it be of value to wrap an Le85?
    I know you directed this to grumpy, but I say "no"

    Don't think you'll encounter too many resonance problems with horns built like the H91!

    What lens you choose (or build) now that's another matter

    Quote Originally Posted by Bluegrassmaven View Post
    Is that a valid tweak or the emperor's new clothes?
    Yes it is "valid" if it cures a problem

    Do you have a problem or are you just looking for one?

  13. #13
    Senior Member grumpy's Avatar
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    yeah... seems unlikely. Properly mount the horn to a baffle
    and support the driver.

    I know of at least one person who used a rubber-like spray on one
    and it did indeed ring -much- less when whacked in free air, but I
    don't recall if the owner thought it made much of an audible difference
    once installed...

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