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How Do I Check For A Bad Driver?

Discussion in 'Amps [BG]' started by Thumper, Dec 30, 2012.

  1. Thumper

    Thumper Supporting Member

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    I have an inconsistent rattle in one of my SWR Goliath III 410s. I want to sell them but I want to fix first if there is a problem.

    Running an Eden WT300 into 2 410s, either 4 or 5 strings, very inconsistent rattle, almost a scraping sound. No high volume used these days as it is a practice rig used in a 3 piece band.
  2. chadds

    chadds

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    I replaced the Celestions in my BBII because the speaker lead the copper one from the lugs to the cone was touching the cone.

    Made a brrr brrr sound like a blown speaker. It's okay. I discovered LDS long throws for the BBII & a Celestion went in the LA-8 which made it a monster.:)
  3. chadds

    chadds

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    Put fingers out surrounding cone and push in. If you feel a scrape or roughness it's the voice coil. Needs a recone. Or just play it louder on a band that likes that kinda thing.:)
  4. Thumper

    Thumper Supporting Member

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    Ok I can check the leads and push in coils. I was hoping some kind of continuity or resistance check could be done
  5. JimmyM

    JimmyM Supporting Member

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    Disclosures:
    Endorsing: Ampeg Amps, EMG Pickups
    My tech found the bad speaker in my 73 Super Reverb that passed the push-in test by plugging each one separately up to a sine wave generator with a freq sweep.
  6. Thumper

    Thumper Supporting Member

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    Thanks Mr M, but that is a little above my meager electronic capabilities/gear. :)
  7. JimmyM

    JimmyM Supporting Member

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    Disclosures:
    Endorsing: Ampeg Amps, EMG Pickups
    Sounds harder than it is.
  8. Thumper

    Thumper Supporting Member

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    You are, of course, right. I think there are a few techs around these parts with the gear. I will check it out.

    Happy New Year to all my Talkbass brothers & sisters.
  9. Steve Dallman

    Steve Dallman Supporting Member

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    A meter will show you if the voice coil is still intact, but will not reveal voice coil rub. Sometimes, glue may let go on the cone (not your description) or on the spider (which could cause your symptoms.) The freq sweep is good. Playing low tones through the speaker alone, out of the box can often reveal the same.

    I've repaired a lot of speakers that were rubbing due to the adhesive holding the magnet to the frame breaking loose. With all of them (10" Alnico speakers, and some 15" bass speakers) I could move the magnet slightly. In one position, the coil would rub. In the other it would be fine. I used an industrial ceramic epoxy forced between the magnet and frame and they were good to go.
  10. BassmanPaul

    BassmanPaul Gold Supporting Member

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    Keep your eyes peeled - bad drivers are everywhere! :D
  11. B-string

    B-string Supporting Member

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    I know they get sent here for the winter :D
  12. BassmanPaul

    BassmanPaul Gold Supporting Member

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    We call 'em Snowbirds!! :bag:

    Nah, that's not fair we older folk ain't necessarily bad drivers. :)
  13. chadds

    chadds

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    Our parents got around in one-wheel drive '40s Fords, etc. and they aren't still stuck in the snow......

    Now I've heard some bad speakers in my time. Let's see...after Kennedy it was a sad show for awhile...:)

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