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  1. #1

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    Default small tear in the speaker surround : how to repair?

    it is a butyl rubber surround, tear is about 1/2" in length.

    what is the best glue to repair this? I have heard:

    1) marine grade silicone
    2) aquarium grade silicone
    3) loctite 411

    anyone know which is best? what do you guys at polk use? [assuming you repair instead of replacing the entire surround]

  2. #2

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    Butyl rubber caulking compound would be my guess.

  3. #3

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    generally the problem of adhesives of any kind is not the strength of the adhesive, but the material its bonded too, generally what ends up happening is the top layer of the material that the adhesive is bonded too will break away over time.

    The best thing you can do is buy a new surround/speaker cone. Other wise its only a temporary fix in any environment where there is a lot of movement/flexing of the repaired joint.

    Also a replacement cone will sound much better then a patched one.

  4. #4

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    Quote Originally Posted by MANSKITO View Post
    generally the problem of adhesives of any kind is not the strength of the adhesive, but the material its bonded too, generally what ends up happening is the top layer of the material that the adhesive is bonded too will break away over time.

    The best thing you can do is buy a new surround/speaker cone. Other wise its only a temporary fix in any environment where there is a lot of movement/flexing of the repaired joint.

    Also a replacement cone will sound much better then a patched one.
    Chances are, once you include your own labor and the cost of adhesive, it's not that much more expensive to replace the driver.

    ? Harmon Kardon AVR 55 (dead; replacing with Onkyo TX NR-616)
    ? Polk RTA 11TL's (FR and FL)
    ? Polk TSi200's (RR and RL)
    ? Polk CS10 (Center)
    ? Polk PSW-350
    ? Grado SR-60i Headphones
    ? Fii0 E5 headphone amp
    ? iPod touch (8 gig)
    ? iPod Classic (80 gig)
    ? Mac Mini (as media server)
    ? xbox 360


  5. #5

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    I do speaker repair and the butyl is an easy fix.
    It's almost always best to replace but a quailty surround repair glue is fine.
    Clean the tear with a good non-residue cleaner, dry thoroughly, open tear enough to get the adhesive into the damaged area, wipe off excessive adhesive and let dry thoroughly. I glue front and back side of the tear.
    It should hold indefinitely.
    I've been using the same glue for about 5 years with no problems.
    Some of the passive radiators from a couple of manufactures I've run into actually get cut from rough edges frame stamping. Since they're no longer in production and parts can't be found except used, repair is the only option.
    I can send you a small amount for the cost of postage if needed.
    Harry

  6. #6

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    some considerations:

    GC Service Cement
    Aileen's tacky glue
    neutral curing RTV (Silicone)

    You want light, strong, and flexible. And you dont' want to overdo it.
    Speaker cone repairing is a bit of an art, but it's not hard. You want to maintian the structrual rigidity of the cone without adding undue mass. Repairing surrounds is a bit trickier due to their function; you want to maintain similar compliance properties. A thin medium like one-ply toilet paper or tissue (model airplane tissue is pretty ideal) may be needed if there's a hole/gap to fill.
    all the best,
    mrh

  7. #7

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    Quote Originally Posted by HB27 View Post
    I do speaker repair and the butyl is an easy fix.
    It's almost always best to replace but a quailty surround repair glue is fine.
    Clean the tear with a good non-residue cleaner, dry thoroughly, open tear enough to get the adhesive into the damaged area, wipe off excessive adhesive and let dry thoroughly. I glue front and back side of the tear.
    It should hold indefinitely.
    I've been using the same glue for about 5 years with no problems.
    Some of the passive radiators from a couple of manufactures I've run into actually get cut from rough edges frame stamping. Since they're no longer in production and parts can't be found except used, repair is the only option.
    I can send you a small amount for the cost of postage if needed.
    Harry
    which surround repair glue do you use? can you provide me an internet link? thanks!

  8. #8

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    How much do you need? I have to buy a minimum of a gallon at a time. I'll be ordering in less than two weeks. I'm down to less than a quart left. It's great glue, dries perfectly clear and does ALL surrounds. Easy to work with, tacks up in less than 10 minutes at room temp, dries completely for use in less than 6 hours. It's flexible, and I use it for about everything that needs glued except for epoxy applications.
    Harry

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