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Thread: Fiberglass Installation Question?

  1. #1
    Senior Member Baron030's Avatar
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    Question Fiberglass Installation Question?

    What is the best way of attaching fiberglass to the inside walls of a speaker enclosure?
    I know this is really kind of a dumb question.
    But, I am trying to decide between using glue or staples on my latest DIY project. For those of you that would recommend glue, which adhesive would work best for this application?

    Thanks,
    Baron030

  2. #2
    RIP 2011 Zilch's Avatar
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    3M Spray Adhesive works for me.

  3. #3
    Senior Member duaneage's Avatar
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    Staples work but not always. Spray adhesive can be a bit messy and it is hard to remove the fiberglass once glued in. Make sure your tuning is done before glueing.

    I would spray a light layer of paint over the fiberglass to keep it from shedding, glass fibers can get into the voice coil gap and cause problems. The fibers can also be launched from the port and that is not healthy. I prefer polyester fiberfill pillow stuffing although fiberglass has better thermo-acoustic properties.

  4. #4
    Senior Member Baron030's Avatar
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    Another Dumb Fiberglass Installation Question?

    Hi Zilch

    I picked up some 3M - #77 Spray Adhesive and I was about to install some fiberglass.
    When, I got attacked by the "HONEY DOs".
    You know those dreaded words that come from "She, who must be obeyed".
    "Honey, could you do this" or "Honey, could you do that".
    And the only reply you can muster is: "But, But, But, I was going work on my JBLs!"
    And then comes the dreaded, "Well, this really needs to be fixed now."
    "Aw Crap, OK"

    Well, I am finally getting back to my project again. And I have one more question.

    Is it better to spray this stuff on the fiberglass or on the wood?

    I know I could run some spraying tests myself.
    But, that takes time, and I know have not heard the last from "She, who must be obeyed".
    So, any advice would be helpful.
    Baron030

  5. #5
    RIP 2011 Zilch's Avatar
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    Instructions say spray on both.

    That's what I do....

  6. #6
    jkc
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    Some thing to try

    On my latest project I used the following method which works OK

    Paint the inside of the box with car panel dampening gook that you find at after market car shops to stop body panels rattling.
    The fibreglass sticks real good to his tar like goo which also helps dampen the panel

    I then staple a layer of polyester fabric lining over as it stops all those glass fibres fling about and holds the second layer of insulation in place.
    There were “deep” braces built into the box so the thin fabric is stapled to the top thin edge and lies flat over 2 layers of insulation.

    I also use mineral glass as used for high temperature insulation around fire places, I reckon it works better.

    I also edge nail and glue 40 x 10 mm timbers in a random pattern all over the inside about 100 to 150 mm apart and on various angels.
    This breaks the panel up into lots of small sections all of different sizes
    I find this works well for stopping panels resonating.

    The theory is that as the frequency decreases the pressure in the box increases.
    If you use a few heavy bracings you lower the resonance of the panel to where the pressure (Lower frequency) is greater.
    You are aiming for a high resonance frequency in the panel, when you do this and rap the panel with your knuckles the pitch will be “higher” and outside the pass band of the woofer hopefully.
    Actually it is interesting this, if you brace a big sub with 4 X 2 and stand behind it you will hear thump thump, if you brace it with thin light bracing you don’t hear much.

    All these techniques are used by various speaker manufactures.

    I then tune the box by adjusting the vent length.

  7. #7
    Senior Member duaneage's Avatar
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    Many sound deadening sprays can contain chemicals which are not good for speakers. make sure to air them out and that any residual odor is gone. Also you would not want to have a funny odor coming from your speakers in the living room.

  8. #8
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    Quote Originally Posted by Zilch View Post
    3M Spray Adhesive works for me.
    That's by first choice, too.
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