Scotch Tape on EMIM Diaphragm?

Discussion in 'Infinity Loudspeakers' started by Bobbyd38, May 14, 2018.

  1. Bobbyd38

    Bobbyd38 AK Subscriber Subscriber

    Messages:
    80
    Should an EMIM driver diaphragm have scotch tape on either side of the ribbons?
    I Opened one up and discovered this, not sure if it’s OEM, or if somebody did it afterwards?
    Thanks,
    Bob
     

     

    Please register to disable this ad.

  2. Tedrick

    Tedrick Infinity-phile Subscriber

    Messages:
    6,825
    Location:
    Gainesville, FL
    Haven't seen tape on the EMIMs in my RS-IIb's or any of the 6 spares I have.
     
    Bobbyd38 likes this.
  3. swechsler

    swechsler Frog Whisperer

    Messages:
    4,689
    Location:
    7th row center
    No, it shouldn't. Maybe the traces were peeling and the previous owner put it there to prevent the problem from getting worse?
     
  4. geoff727

    geoff727 Well-Known Member

    Messages:
    698
    Location:
    Seattle, WA
    emim-frt-m[1].jpg

    If you're referring to the center 2 traces that appear less wrinkly but duller in appearance, that is because there is Scotch tape on those traces. Yes, this was very common. You will find many EMIMs like this. The earliest EMIMs (early RS2.5 and 4.5 varieties) did not have it. Later, as things progressed to the RS 1/1b's, middle IRS series, RSIIa/b, pretty much all of them had diaphragms taped down the middle. I presume this was done to add just a bit of mass to the diaphragm or help control a certain resonance property. Later, when the neodymium-based EMIMs started to come out on the IRS V's, Beta's, etc. the tape seemed to go away again.

    However, if this isn't what you're talking about, then maybe it was a repair attempt or something else. If this is what you have, don't try to pull the tape off. You'll very likely ruin the diaphragm.
    G~
     
    Last edited: May 15, 2018
    E.Man and Bobbyd38 like this.
  5. cdfac

    cdfac AK Subscriber Subscriber

    Messages:
    6,021
    Location:
    Iowa City
    i have seen it as well.
     
    Bobbyd38 likes this.
  6. tubed

    tubed Lunatic Member

    Messages:
    14,799
    Location:
    Aztlan
    Scotch tape + aluminum foil makes for an excellent repair.
     

     

    Please register to disable this ad.

  7. slimpikkins

    slimpikkins Super Member

    Messages:
    1,769
    Location:
    South East PA
    My RSIIb have tape from factory, RS2.5 do not. It keeps them together. The center traces were probably blowing out and infinity added the tape on the later ones to get more miles out of them. Or as Geoff said to add some mass.
     
    Last edited: May 17, 2018

Share This Page