Need Help with Cab Speakers

Discussion in 'Amps and Cabs [BG]' started by eph826, Jul 28, 2021.


  1. eph826

    eph826

    Jul 28, 2021
    Hi there! I'm new here and new to cabs, as well. I bought a GK 810GLX and thought it would be an easy project. Well here I am.

    I don't know the technical terms, but four speakers out of the 8 have a wire that seems to have burned off. Here are pictures:
    20210728_200421.jpg 20210728_200346.jpg
    So my questions are:

    1. What caused this and
    2. Is the fix to simply resolder the wire?

    Thanks!
     
  2. wave rider

    wave rider

    Jan 5, 2005
    My memory may be wrong, but I remember the wires from the terminal going to the voice coil being thinner an flexible. Get in there with a light and check. Those ones with black insulation look much too heavy…
     
  3. Redbrangus

    Redbrangus Supporting Member

    Nov 19, 2018
    Under The X In Texas
    It's really hard to tell much from those photos, but it's clear the leads to the voice coil are no longer connected. To a certain extent, it IS just a matter of resoldering the connections, but those failed for a reason that I can't discern from the pics. I'm kinda with @wave rider - those tensile leads should be very thin and flexible, and I haven't looked at too many modern drivers (except for those from just one manufacturer), but I can't say I've ever seen a case of those thin tensile leads being insulated. Those leads have to be very strong and flexible, since they get flexed thousands of times per second ad infinitum, hence the requirement that these be that highly specialized, high-tensile-strength wire. It's not clear to me that's what's there with the drivers in the pics. I presume you did not buy this cab new? And what do you mean by "...and thought it would be an easy project." -- did the cab need some other repairs?

    Edit: After looking at the magnified pics more closely, it looks kind of like the failed wires actually are the proper type, or at least could be, especially in the first of the two pics. I guess it couldn't hurt to resolder them and see how long they last. The problem is the solder that wicks up the wire during the soldering process makes the leads themselves stiff and they will tend to break at the point where the solder stops -- at the transition from stiff to flexible. This is the reason for that elaborate soldering arrangement where the leads are drawn through the terminals and soldered on the opposite side -- this is to help prevent that solder wicking from extending up to the part of the wire that must remain flexible. This may have been the problem that led to the failure of these leads in the first place. Do you know of a speaker repair shop... where you can get a speaker reconed? They might be able to effect a more durable repair than you can. Maybe.
     
    Last edited: Jul 28, 2021
  4. mmbongo

    mmbongo I have too many basses. Supporting Member

    Not much to add, but the reason why those leads are insulated is probably because the cones are metal. If both wires were to touch the cone the would short out, which is not an issue with a normal paper cone speaker.

    And yes it's just a matter of resoldering them. But now the problem is that they will be too short, and you can't have them pulled tight. Also, something made them break so that may be an issue as well.
     
  5. eph826

    eph826

    Jul 28, 2021
    Thanks for all the feedback, guys.
    So I bought this cab at Goodwill for $40 and a Google search for "GK 810GLX" sounded worth it. When I got it home to test it, I found 4 of the 8 speakers didn't work and found this when I opened it up. It's definitely OEM - just old. Probably why it ended up at Goodwill.

    What I'm gathering is, because it's older and uses an older style of wiring (insulated, thicker), repairing it may not be feasible. The remaining cable is too short and due to the constant vibrations, the solder would not hold very long.

    SO - should I just cut my losses? Or is this cab worth fixing? If worth fixing, I presume that would involve reconing the 4 speakers.

    Lastly, what would have caused this and can I be sure it won't happen again? My uneducated guess is it happened from someone using the wrong head. ‍♂️

    Some more pictures just because
    20210728_221854.jpg 20210728_221907.jpg 20210728_200522.jpg 20210728_200834.jpg 20210728_200617.jpg
     
  6. wave rider

    wave rider

    Jan 5, 2005
    Good call. I remember seeing but didn't remember the details of GKs with metal cones. D'uh!
     
  7. mmbongo

    mmbongo I have too many basses. Supporting Member

    I think that somebody that knows what they are doing could fix them easily. The wire itself is fine, they have been using that wire for speakers for 900 years. Yours are just thicker/insulated to keep them from touching the cone.
     
  8. Redbrangus

    Redbrangus Supporting Member

    Nov 19, 2018
    Under The X In Texas
    Presuming it is the right wire -- which it appears to be -- the problem of the shortened length would still need to be addressed. You'll notice that the original wiring had about a half-inch of excess on the soldered side, and again, this is to try to help alleviate the solder-wicking issue.

    A simple re-soldering might get them to work again for a while, but wouldn't be a reliable repair, IMO. A less-than-scrupulous person might effect that repair and put the fully working cab on Craigslist at an appealing price. (Of course, I'm sure no TB-er would do that sort of thing. :D)
     
  9. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    The insulation on the wire is actually a silicone type damping sleeve to limit the resonance of the wire (and fatigue failure).

    More often than not, this type of failure cones from beating the drivers to within an inch of their lives over time.

    A pro recone shop might be able to replace the tinsel wire, but usually it’s not a practical repair long term. It’s also not an easy repair since the dust cap needs to be removed and replaced too. If the junction with the VC lead out wire is embedded in epoxy or MEK adhesive, it’s pretty much impossible.
     
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  10. arbiterusa

    arbiterusa

    Sep 24, 2015
    SoCal
    The GK goldtone speakers are notorious for blowing easily and that’s what’s happened here. Somebody hit em with way too much power. Given that you’re only in for $40, I’d bail on this project.

    However.

    If you really want this fixed, I’d simply keep scanning the GC online used section. GLX cabs show up all the time. Last I looked 410s were running around $199. Of course, those might be blown too, it’s not like GC checks their used gear with any kind of care. But you could, in theory, have an 810 GLX cab for around $300-$400. Me, I wouldn’t do it.

    edit: fixing this or buying drivers is doubly risky because the survivors got hit with the same abuse. There’s probably at least one or two in there that are one set away from going to the great speaker box in the sky no matter how careful you are.
     
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  11. For 40$, I'd probably try to solder the wire back again, if only to learn a thing or two about speakers. And if the speakers get beyond repair, I'd convert the 810 into 410, if only to learn a thing or two about boxes. You might even end up with a perfectly working cab!
     
  12. silky smoove

    silky smoove Supporting Member

    May 19, 2004
    Seattle, WA
    I know this was just a typo, but it really made me smile. Here were some other notable things that happened in the year 1121 :smug:
    1121 - Wikipedia
     
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  13. mmbongo

    mmbongo I have too many basses. Supporting Member

    Well not really a typo but an exaggeration :)

    Besides, how do you think the speakers that Petronilla of Lorraine used were built??
     
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  14. silky smoove

    silky smoove Supporting Member

    May 19, 2004
    Seattle, WA
    Her husband was called Floris II The Fat. I think ol’ Petronilla had bigger problems than speaker wiring :p
     
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  15. mmbongo

    mmbongo I have too many basses. Supporting Member

    Well that does it. I'm officially changing my cat's name to Floris II The Fat!
     
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  16. jimkelly

    jimkelly

    Sep 23, 2009
    Nashua,NH
    About 3 or 4 years I picked up a used GLX210 for free. It wasn't working and had the same lead breaks (one each)as in the OP's photos. Neither speaker was blown. It seems the leads are tight with hardly any droop. I extended them with a length of braided solder wick and the cabinet was working again.
     
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  17. hbarcat

    hbarcat Supporting Member

    Aug 24, 2006
    Rochelle, Illinois
    ^^^ I'd try what @jimkelly said, first.



    Failing that, I'd cut the cabinet in half and make it into a 4x10.

    It's rated at 4 ohms with all 8 speakers running. The speakers are the GK Paragon 10s, which are 32 ohms each.

    With only 4 speakers connected, the cab will be rated at 8 ohms. Also the power handling will be cut in half.
     
    Last edited: Jul 30, 2021
  18. eph826

    eph826

    Jul 28, 2021
    Lots of information here - I really appreciate it. I'm probably going to cut my losses and try it out as a 4x10 cab, considering I'm not the best at soldering. Thanks again, everyone!
     
    Last edited: Jul 31, 2021
  19. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Are there separate air spaces for each group of 4 drivers? If so, you should be ok.

    If all of the drivers share a common air space, that not going to work very well and the drivers need to be derated due to the incorrect acoustic loading. Probably by ~50% at least.
     
  20. You can stop the solder wicking up the tinsel leads by holding them with needle-nose pliers just under the terminal when soldering. Chances though, they are they are too short now to resolder.
     
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  21. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    May 23, 2022

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