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DIY Flat Panel Speaker Love

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  • Unbiasedsound
    replied
    Yes....I have used both sides with glue before but just as long as the surface contact area is smooth/clean the sticky adhesive works really well.

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  • allenb
    replied
    Do you utilize the adhesive on that side and use pva on the non-adhesive side?

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  • Unbiasedsound
    replied
    I dont think so but I am not totally sure. The Frost King foam I use only has one side that has the sticky adhesive.

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  • allenb
    replied
    Do you know if frost king makes a foam weather stripping in the size you mentioned without adhesive on either side. Was thinking it would be easier to install and for the pva glue to adhere to the foam weather stripping alone.

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  • Unbiasedsound
    replied
    PVA wood glue like Tightbond or Elmers

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  • allenb
    replied
    Understood and makes sense. What have you found is best to use for gluing the foam to frame and panel?

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  • Unbiasedsound
    replied
    The compression does not need to be that high it just has to fit smug enough so that the panel does not fall out of the frame when placed upside down. Plus you have to glue both ends of the foam one to the panel and the other side to the frame.

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  • allenb
    replied
    Ok, understood. The foam pressed into the gap is the only force keeping the panel centered within the frame and must have enough force to prevent the panel from eventually relocating itself in or out of center in relation to the foam surround due to vibration.

    So, with that said, with the 3/16" foam thickness you use for your surround, how much less is the gap you utilize (less than 3/16") so I can get an idea of how much the foam will compress to ensure I have enough holding force to prevent the panel from moving in or out of the frame due to normal vibration? Would a 1/8" gap between frame and EPS panel allow enough compression when inserting the 3/16" foam in the gap?
    Last edited by allenb; 10-26-2021, 05:42 PM.

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  • Unbiasedsound
    replied
    Found a better pic. This new version of Bertagni speakers use the foam surround all around the sides of the panel the same way I do it.

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  • Unbiasedsound
    replied
    Its hard to explain but its similar to this pic >

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  • allenb
    replied
    The way I do it is the foam goes inbetween the gap between the frame and the panel sides (thickness).

    Ok after much thought on this, this will be the method I experiment with. A question on how you do your frame with this in mind. Does your frame sandwich the area where the foam resides in the gap and a little of the first bit of panel or is the foam surround and all of the panel free floating with the only locating force keeping the panel centered on the surround being the pressure of the surround exerted on the edge of the panel?

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  • Unbiasedsound
    replied
    No, but I am not saying you cant use it that way as like I said before in my other post that there are many ways you can mount the eps panel to the frame with the frostking foam as there is no really right or wrong way just personal preference.

    The way I do it is the foam goes inbetween the gap between the frame and the panel sides (thickness).

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  • allenb
    replied
    Click image for larger version

Name:	DML panel foam surround 2.png
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ID:	1477797 Ok, I'm having a complete block and not able to envision how the foam surround is existing in relation to the frame and the panel. Let me give you a verbal visual example of what I thought was the layout.

    Suppose we have a 9" x 14" x 1/2" panel laying on a table. Next to one edge of it we have a 1/2" thick x 2" wide by 9" long board laying adjacent to the 9" wide end of the panel. Now, we lay our adhesive backed foam surround down on top of the two pieces with half of the width of the adhesive foam surround laying down one edge of the panel and the other half laying down the length of the board. The board being one member of the frame. In this layout, the foam bridges the frame and the panel with a small gap in between the two.

    Is this how you are intending the foam surround to be used?

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  • Unbiasedsound
    replied
    Yes......not sure exactly how thick the foam but my guess is around 3/4-1inch. thick. Also thicker the foam equals more damping while thinner the foam less damping. For my (1/2inch thick) panels i use the 3/16inch thick by3/8 wide Frost King rubber foam as they come in different sizes for you to choose. If you need more damping just go one size larger. Also the larger the panels the larger the foam surrounds need to be to support the heavier panels.

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  • allenb
    replied
    So, the Bertagni in the photo you posted, the foam surround is adhered to the frame and to the back side edge at a width as wide as the cutouts and is not protruding into the cutouts?
    How thick do you think this band of adhesive backed foam surround is?

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