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Thread: A7 horn vibration reducing mix

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    Senior Hostboard Member les winter's Avatar
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    A7 horn vibration reducing mix

    North Creek was a speaker manufacturer (no longer in business) who recommended Glop as a wall deadening solution. It consists of a 2:1 mixture of Aleene's Tacky Glue and drywall compound. I was thinking of using it for the interior of the curved horn parts of my in-progress A7 project.

    Has anyone tried it?

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    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    I am assuming your motorboard does not extend all the way to the sides of the cab? I have heard of a few different solutions for people that do not have sealed horn flares. Roofing tar etc.

    Also there are guys that extend the motorboard and seal the flares, then fill them with sand, kittylitter, or shot etc.

    I was thinking about going that route with mine, but am curious about this Aleenes and drywall mud combo. I am assuming the Aleenes is there to make the mud stick better?

    My 828 cabs are braced, but I haven't deadened the flares yet.

    Edit: I am most interested in this Aleenes solution because I happen to have it and drywall mud right now. Maybe If I get some extra time tomorrow I'll make up a little test batch
    Last edited by Elitopus1; July 3rd, 2017 at 09:30 AM.

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    Senior Hostboard Member les winter's Avatar
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    Re: A7 horn vibration reducing mix

    I intend to extend the motor board and cut holes in it. I'll seal the curved horn to the top sides and bottom with a bead of Locktite PM on the inside edges.

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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: A7 horn vibration reducing mix

    Install a 3rd brace centered between the factory top and bottom braces, it's well worth the time/effort and makes any other sort of magic damping kind of moot. I used 3/8 fir plywood for the curved flares themselves. Between that and the 3rd brace i could find no reason to get carried away with sand filling, or kitty litter or any other exotic solution. I just packed the cavities with OC pink fiberglass.
    Not all vegetables make good leaders.

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    Senior Hostboard Member LowOhms's Avatar
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    Re: A7 horn vibration reducing mix

    OK folks,

    three questions here :


    Q1. : Subjectively speaking, what do people HEAR, before and after they finished damping the curved thin plywood bass horn sides on an 825 enclosure ??

    - - - - - - - - - -


    Bowtie, I liked your post, on adding a middle brace, a whole lot !!

    I am a novice / newbie when it comes to wood working.

    Q2. : What glue would be good to use?

    Q3 . : I have some one by two inch OAK, and I am mulling over using that as a middle brace for 70% of the span ( avoid corners - no hot spots wanted as per GM ). Comments, critique, anyone ??


    TIA.



    Jeff Medwin.....Low Ohms

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    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by bowtie427ss View Post
    Install a 3rd brace centered between the factory top and bottom braces, it's well worth the time/effort and makes any other sort of magic damping kind of moot. I used 3/8 fir plywood for the curved flares themselves. Between that and the 3rd brace i could find no reason to get carried away with sand filling, or kitty litter or any other exotic solution. I just packed the cavities with OC pink fiberglass.
    Have any pics of the braces you made?

    I have seen a couple different types of horn flare braces. The first type is like the rib in a wood boat. The second one is a bigger piece of plywood, either solid or with a cutout in the middle. The plywood version extends all the way to the outer wall and gets glued on there also

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    Senior Hostboard Member LowOhms's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by Elitopus1 View Post
    Have any pics of the braces you made?

    I have seen a couple different types of horn flare braces. The first type is like the rib in a wood boat. The second one is a bigger piece of plywood, either solid or with a cutout in the middle. The plywood version extends all the way to the outer wall and gets glued on there also

    Hi,

    Have NOT yet cut oak, thats why I posted and asked for opinions and critique before sawing away.. Only traced the flare shape onto paper.

    I was thinking of a rib, to avoid large side panel vibrations being transmitted to the bass flairs, but either would do fine I'd GUESS. One could theorize it, either method !!

    Jeff

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    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    I figured if he used plywood, the piece is large and flat. I could be wrong though

    Jeff, it would be really slick to cut some oak and steam it into a curve. It would be like antique boat building!

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    Senior Hostboard Member endeeinn's Avatar
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    Re: A7 horn vibration reducing mix

    I filled mine with expanding foam. Knuckle rap is solid.

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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: A7 horn vibration reducing mix

    Have any pics of the braces you made?
    To give you an idea of how long ago i built them, the build pics are locked up in a PC with a failed hard disk, It's a windows 3.1 machine that was upgraded to win 95 when it came out.

    The braces i used were as shown in the factory drawings. When i was cutting and sanding, i simply made a dozen instead of 8, and centered the additional brace between the factory braces on each flare. I have seen other builds using as many as 6 braces behind each flare. I made the flare's themselves out of 3/8 fir plywood as i was told it was the strongest/densest ply you can get to bend well. It gives you nasty splinters too.

    They look pretty much like this except cut from 7/8 x 3 red oak:

    1
    Not all vegetables make good leaders.

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