PA Speaker Problem?

Discussion in 'Live Sound' started by allenk, Apr 6, 2009.

  1. allenk

    allenk Guest

    My band had to use different speaker cabs for our gig this weekend. One of our band members has a pair of sound techs dual 15" w/horn and a pair of single 15" sound techs w/ horn. The speakers are around 12 years old and had been in a storage unit with no heat or ac for most of the past 4 years. We hooked them up mono into alesis EQ, dbx crossover, hi-mids out, to mackie 800 watt amp for the duals, Nady 800 watt for the singles. We had alot of people at our gig including other musicians telling me the sound was great! I was worried because we didnt
    have much time to setup and test the different cabs. We had another player friend get up to do a couple of songs so I could go out and check out the sound. I heard a little distortion, no channels or amps were clipping anywhere. Upon further inspection I noticed that on all 6 15" speaker the orange foam surround was almost completely gone. I felt the foam and it was pretty brittle and would disentegrate easily.

    OK, theirs the story- thanks for reading so far. My questions are
    1) Do you think even if the foam was getting old they would all go at once?
    2) Or would it have to be another problem like too much volume, out of phase, ect...

    We setup jbls the next night without any problems. The only thing we changed was to a different crossover because one of the pots was dirty.

    Old foam or something else?

    Thank You, Kevin :?

  2. BobRogers

    BobRogers Distinguished Member

    Apr 4, 2006
    Blacksburg, VA
    Old foam stored in conditions that it didn't like. I'd expect it all to go at once. Time to recone.
  3. stealthy

    stealthy Guest

    I'm sure, leaving them in storage was not the most wanted conditions by the speakers. Sounds about right. Between the age, and weather conditions, it doesnt surprise me.
  4. allenk

    allenk Guest

    I would have to agree that the foam was in bad shape. I did`nt expect to see them go all at once though, until I picked up a piece of foam and easily crumbled.

    If anyone has different opinion let me know.

    Thanks for the reply.

  5. Codemonkey

    Codemonkey Distinguished Member

    Dec 11, 2007
    Scotland, UK
    I think, having all the speakers in the same storage place for the same length of time, they'd be exposed to the same conditions, so personally I think it's logical that they would all go at the same time.
  6. moonbaby

    moonbaby Mmmmmm Moderator

    Feb 23, 2005
    UV exposure, humidity levels, etc., all affect foam speaker surrounds, and the ones made in the 70's and 80's are more adversely affected than those made with newer materials.
    You should try to locate a speaker reconing/repair shop in your area. They may be able to replace the surrounds rather than a total re-coning.
    My shop has been able to do that a lot. You don't want to pump the speakers before you have this done, though. If enough of the surround is crumbled, it no longer will support the cone/voicecoil assemly, and then that will cause it to rub and eventually burn out. The speakers in your cabs were manufactured by Eminence, these are readily serviceable.

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