Infinity IRS Sigma EMIM - What Should I Do About This???

Discussion in 'High End Audio' started by victim_of_hype, Oct 6, 2006.

  1. Take a look:

    Has anyone seen this before?

    Whatever this is, it came one very rapidly. I inspect these speakers
    often and this just became apparent over the past 2 weeks.

    Strangely, it doesn’t appear to have any impact on the sound. I ran
    sweep tones at 90DB and both speakers sounds just fine.

    What, if anything, should I do about it?


    victim_of_hype, Oct 6, 2006
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  2. victim_of_hype

    Peter Wieck Guest

    Looks like ozone attack on the foam damping material. Which is endemic
    of a certain generation of speakers, all makers, many models.

    My advice would be to use a soft brush to remove the loose material
    (and it will continue until it is all gone) and hope that the
    deteriorated foam does not serve as a critical gasket, spacer or
    vibration dampener under operating conditions. If it does, you will
    have to do the functional equivalent of replacing a normal cone-speaker
    surround.. which fail in the same way, usually suddenly and all-at-once
    as you experienced.

    Infinity is still with us, so they may be aware of this and have a
    ready fix available.

    Peter Wieck
    Wyncote, PA
    Peter Wieck, Oct 6, 2006
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  3. victim_of_hype

    Mike Gilmour Guest

    The coating that was applied on to the magnets is now peeling. The action is
    to disassemble the unit, remove the remainder of the coating and replace
    with an equally thin film of corrosion inhibitor. The magnets are powerful
    and disassembly and reassembly should be done as per instructions.
    (Somewhere I have that information - I'll look it out).


    Mike Gilmour, Oct 6, 2006
  4. Much obliged Mike, that information would be most helpful.


    victim_of_hype, Oct 7, 2006
  5. victim_of_hype

    Mike Gilmour Guest

    I have located the pdf Infinity Service Bulletin regarding EMIM surface
    peeling from magnet assembly and how to rectify the problem, will send to
    you direct.

    Mike Gilmour, Oct 7, 2006
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