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Speaker repairs

Discussion in 'Electronic Repair' started by [email protected], Feb 1, 2007.

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  1. Guest

    I have a pair of really nice three way Pioneer speakers. They stand
    about 3.50 ft. off the floor and use 12 inch woofers. The foam rings
    around the circumferance of the cones has rotted away leaving the
    paper cone supported only by the center suspension. I've seen on the
    Internet and in catalogs foam repair kits. The sellers make the repair
    sound so easy but I'm concerned about how you actually center the cone
    when you glue, ( I assume) these rings into place. Way back in the
    stone age, 1920's speakes used three shims which you stuck down
    between the inside of the voice coil and the magnet to center a new
    cone which you were installing. This was after you glued your old
    voice coil onto the new cone. You then glued the new cone and the
    cardboard ring in place. It was a tedious job the say the least. With
    these foam jobs, do you have to rip off the center cardboard or felt
    disc which protects the voice coil and magnet area to shim the cone
    when attaching these new foam rings? If anyone has performed this type
    of repair and can share the details of the procedure with me I would
    be very grateful. Thanks for any help. Lenny Stein, Barlen Electronics.
  2. UCLAN

    UCLAN Guest

    These aren't HPM-100 speakers by any chance? I saw woofer repair
    kits for these on ebay just the other day.
  3. Ray L. Volts

    Ray L. Volts Guest

    Steps 8 & 9 comprise one generic method, which may be of some help.
    But this certainly doesn't apply well to every speaker, so YMMV:
  4. refoaming service.

    Mark Z.
  5. Bob Urz

    Bob Urz Guest

    Not ever speaker is a candidate for refoaming. If you don't use the
    shims (and take off and replace the dust cap, you run the risk of off
    center rubbing voice coil. also, if ALL the foam is rotted out and the
    speaker was run like that, the voice coil former may be warped or bent
    now making a refoam a futile effort.

    certain cones are more problematic to refoam. The best situation is
    paper cones with foam on top. The worst are plastic cones and cones with
    the foam stuck to the under side of the cone. Its takes a lot of careful
    prep work to scrap all the old foam off the cone and the frame to make a
    good surface for the replacement foam to adhere properly. They usually
    use a glue like airflex 400 (looks like white elmers glue)

    What's a refoamers nightmare? Bose 801's.

  6. Paul

    Paul Guest

    There are a lot of people who claim success refoaming certain types of
    woofers (ones with large gaps like Advent or EPI) without shimming the
    voice coil. I always shim the VC when refoaming. Cutting away the
    dust cap, shimming, and replacing the dust cap is very easy and
    quick. Removing the old foam/glue, cleaning the residue, and glueing
    in the new foam is very time consuming and tedious. If you skip the
    easy part (shimming) you risk having to do the PITA part (replacing
    the surround) over again.

    If you have not bought the new surrounds yet, check with They sell surround kits which include an excellent
    how-to DVD. If you have never done it before, the instructional DVD
    alone is worth the price of the whole kit.

  7. Rob Mills

    Rob Mills Guest

    the price of the whole kit.<<<

    It's the most complete kit for the money I've seen so far. Thanks for
    posting, RM~
  8. Rob Mills

    Rob Mills Guest

    I down loaded it (57mb to a zip disk) last night and watched it. It really
    is informative for someone (me) who has not refoamed a speaker before.
    It also convinced me that removing the dust cover and shimming the coil
    is a real worth while way to go, particularly someone like myself who hasn't
    developed the feel for the proper clearance. RM~
  9. Adrian C

    Adrian C Guest

    Thanks for sharing this info. I downloaded the video as well - a good
  10. ab0wr

    ab0wr Guest

    I have re-foamed a number of 10 and 12 inch woofers. If the speaker is in
    good shape except for the foam surround it should be simple to remove the
    old foam, carefully scrape all the old residue off the paper and the shell,
    and re-glue in a new surround. Take your time and be careful. You need to
    either get a kit specifically for your speaker or make sure that the kit
    supplied can be trimmed to fit properly between the shell and the paper.

    Good luck.

  11. Rob Mills

    Rob Mills Guest

    I ordered my woofer repair kit via U.S. mail a week ago to day from
    WooferRepair. I got the kit today, 7 days later. I figure that's pretty
    quick considering I ordered by mail so I could pay by check. Everything
    looks great, just as specified at their web site. Now if I can get my part
    done. RM~
  12. Rob Mills

    Rob Mills Guest


    I did my first set of 10 inch woofers using the kit and
    everything went great. I got a little anxious on the first one and attached
    the surround to the cone after letting the glue set for only 5 min which
    kept me very busy pressing out the wrinkles for about 30 min. I waited
    10 min on the second one and everything went well, didn't need any
    clamping and the joints actually pulled them selves tighter as they dried.

    Shimming was a piece of cake with the plastic shims that wooferrepair
    supplied. I don't know but suspect that using the paper shims supplied
    by some vendors could be a nightmare as it takes a little force to get
    them in, might have to soak them in a solution of viagra.

    Someone mentioned that they used tacky glue from a crafts store to
    attach the surrounds. Out of curiosity I picked up a bottle of Aleens
    "original tacky glue" (they have several different types). I tested it and
    compared it with the glue supplied with the kit and it has the same
    amount of tackiness after drying a few min and even smells the same
    (If it looks like a duck, quacks like a duck, it's a duck). I do believe
    that in my next woofer repair (I have several more to do) I will use the
    $2 surrounds from MAT electronics and tacky glue but highly
    recommend for the first time. RM~
  13. jakdedert

    jakdedert Guest

    I just bought a kit from a local supplier off eBay. I didn't actually
    know that they were local, but used them because they supposedly had a
    kit that was specific to my particular woofers. Turned out that it
    wasn't; but it was close enough.

    The kit came with paper shims, which were kind of a PITA, but not
    impossible even for a 1st timer. I expected new dust caps, but instead
    I got instructions to slice around the periphery of the caps, then
    reglue them. I can't even see the joint; but this obviously wouldn't
    work with an aluminum cap.

    All in all, the job turned out well; and I'm very pleased with the
    effort. The $14.99 thrift-store EPI's sound great!. Do you have a link
    to MAT? I have enough glue left to do at least four more 8"ers and shim
    stock appeared to be simply card stock. No reason to spend another $25
    for the next pair if I can do it for $4.

  14. Rob Mills

    Rob Mills Guest


    I have seen those instructions and they make me nervous. They suggest that
    you cut it just above the glue line. I've noticed that in some speakers the
    voice coil leads exit through the cone just a fraction below that glue line
    of the dust cup. Think I'll pass. Guess if you were doing this every day you
    would probably get pretty good at judging where and where not to slice. They do have a $25 minimum but that's better than
    shelling out $25 and getting nothing but 1 pair of surrounds.

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