What's the bad news if my speaker doesn't work and shows 1 ohm?

Discussion in 'Amps and Cabs [BG]' started by Oren Hudson, Nov 19, 2017.

  1. Oren Hudson

    Oren Hudson

    Dec 25, 2007
    Gastonia, NC
    One of the 15" speakers in a cab that I just got doesn't make any noise and reads 1 on the ohm meter. No visible damage and no rub.
     
  2. Shorted coil. Recone or bin.
     
  3. Oren Hudson

    Oren Hudson

    Dec 25, 2007
    Gastonia, NC
    That's what I was afraid of. Thanks for the info.
     
  4. Stumbo

    Stumbo Guest

    Feb 11, 2008
    The ohms have left the building!
     
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  5. BassmanPaul

    BassmanPaul Inactive

    It would help if we knew the make and model of the cabinet and of the driver within it. :)
     
    BadExample, Bassmec and rodl2005 like this.
  6. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    True, many Bose drivers are in fact 1 ohm voice coils... (not common, but possible)
     
  7. Oren Hudson

    Oren Hudson

    Dec 25, 2007
    Gastonia, NC
    Eminence 15" from April 1977.
     
  8. Bassmec

    Bassmec

    May 9, 2008
    Ipswich UK
    Proprietor Springvale Studios
    Well if you are measuring directly from the loudspeaker terminals with an accurate meter with all cabinet wiring disconnected and thus not figuring in the equation, we can say for certain that you have a short circuit in your loudspeaker.
    As I would imagine your loudspeaker was produced in both 8 and 16 ohm nominal impedance versions, if it was 8 Ohms impedance it would read less on the meter as the meter is reading DC Ohms resistance not impedance.
    This is an 8Ohm nominal driver.
    image.jpeg
    Shows 5.6 Ohms DCR on a military grade fluke meter.
    "your mileage may vary"
     
  9. BadExample

    BadExample

    Jan 21, 2016
    Injiana
    Bad neighborhood? :D
     
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  10. Bassmec

    Bassmec

    May 9, 2008
    Ipswich UK
    Proprietor Springvale Studios
    Nope just mis spent my youth in marine engineering with that. It's handy that it floats and is waterproof.:)X
     
    BadExample likes this.
  11. BurningSkies

    BurningSkies CRAZY BALDHEAD

    Feb 20, 2005
    Syracuse NY
    Endorsing artist: Dingwall Guitars
    This is perfect if you own an amp that runs at 1ohm.
     
  12. Another possibility is that you have lost your hearing, and your meter is out of calibration.;)
     
  13. two fingers

    two fingers Opinionated blowhard. But not mad about it. Inactive

    Feb 7, 2005
    Eastern NC USA
    Here's 4 more. Now you have 5.
    cfe75b0c50a8cd1440e6634e13c16a14--meditation-center-yoga-meditation.jpg

    Seriously though, good luck with it.
     
    Marko 1 likes this.
  14. beans-on-toast

    beans-on-toast

    Aug 7, 2008
    Inspect the speaker’s tinsel connections, at the terminal and at the cone where the coil connects. If in doubt, resolder the terminal connections.
     
  15. BurningSkies

    BurningSkies CRAZY BALDHEAD

    Feb 20, 2005
    Syracuse NY
    Endorsing artist: Dingwall Guitars
    I've been told that my meter's out of calibration. But enough about me.

    Onward to the search of a one-ohm or less safe bass head.
     
  16. BadExample

    BadExample

    Jan 21, 2016
    Injiana
    You might know, but... Be sure to unplug the speaker from the wiring before measuring.

    Sadly, it's probably toast anyway.
     
  17. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    This won't cause a 1 ohm reading.
     
  18. beans-on-toast

    beans-on-toast

    Aug 7, 2008
    True, but show me a typical hand held ohm meter that can accurately read 1 ohm. I'm not convinced that the reading is correct. It makes sense to closely inspect the speaker for issues.
     
  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
    Agreed, but a damaged tinsel wire typically reads high or open.
     
    beans-on-toast likes this.
  20. beans-on-toast

    beans-on-toast

    Aug 7, 2008
    A shorted coil reading low ohms and no rubbing with free movement of the cone doesn't usually add up. Maybe enough ferrous particles in the coil gap.