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Thread: Repairing CBM-170 Butyl Rubber Surround

  1. #1
    Join Date
    Nov 2005
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    7

    Default Repairing CBM-170 Butyl Rubber Surround

    One of my beloved CBM 170s has a tear in the butyl rubber surround (photo attached).

    Could anyone suggest how to repair or replace this? These are such awesome performers (presently used as near-field monitors for my PC), and I really want to fix this, even if it's mainly cosmetic.

    cbm-170-sm.jpg

  2. #2
    Join Date
    Jan 2014
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    Minnesota
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    165

    Default Re: Repairing CBM-170 Butyl Rubber Surround

    I’d call Ascend and order a new woofer. Easy peasy.

  3. #3
    Join Date
    Mar 2016
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    The Mile High State
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    Default Re: Repairing CBM-170 Butyl Rubber Surround

    How old are they? Yeesh.

  4. #4
    Join Date
    Mar 2004
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    SouthWest of Cleveland
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    1,924

    Default Re: Repairing CBM-170 Butyl Rubber Surround

    Quote Originally Posted by 14er View Post
    How old are they? Yeesh.
    That's a good question, considering the woofer changed somewhere down the line. The original non-SE CBM-170's used an Aerogel woofer, but has since gone with a polygel type. Not sure if this matters but Ascend can tell you based on the serial number of the speakers.
    Ed

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  5. #5
    Join Date
    Aug 2003
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    USA
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    Default Re: Repairing CBM-170 Butyl Rubber Surround

    Quote Originally Posted by Austinbirdman View Post
    One of my beloved CBM 170s has a tear in the butyl rubber surround (photo attached).

    Could anyone suggest how to repair or replace this? These are such awesome performers (presently used as near-field monitors for my PC), and I really want to fix this, even if it's mainly cosmetic.
    Definitely not cosmetic -- a torn surround like that will completely throw off the compliance of the woofer. It will eventually fail with a burned or shorted voice coil...

    You definitely need a new woofer, simply give us a call at the office
    .
    .
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    Good Sound To You!

    David Fabrikant
    www.ascendacoustics.com

  6. #6
    Join Date
    Nov 2005
    Posts
    7

    Default Re: Repairing CBM-170 Butyl Rubber Surround

    It's one of the originals, bought in 2004 or 2005.

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