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Help, tweeter with very high impedance.

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  • Help, tweeter with very high impedance.

    Got a pair of old JBL 2060 speakers at the local goodwill. Very very cheap, sound good except for one thing. One tweeter seems to have a reduced level, maybe 5-6 db less than the other and it sounds a bit "different" also, hard to explain.

    I just did impedance sweeps, the one is normal around 6 ohms and rising a bit from 10k-20k and a resonance at about 2400k

    The other is around 47-48 ohms over the entire sweep and it jitters up and down over the entire range somewhat.

    Anyone seen a tweeter that still worked and measured like this?

  • #2
    Corrosion will to this. If the small copper leads of the coil are oxidized all the way through, they act more like a resistor than a conductor.

    Also depending on where you are testing,make sure it is not the leads connected to the tweeter terminals.

    Do a resistance check for DCR with a meter, that will tell you a lot about what is happening.
    .

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    • #3
      If you are seeing a very jagged impedance graph, you might also have a rubbing voice coil or something in the voice coil gap. Can you hear any strange noises on the sweep?
      -Kerry

      www.pursuitofperfectsound.com

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      • #4
        No rubbing sounds or anything honestly.
        DCR is like 5.5 ohms.

        But Impedance is 47-48 ohms.....very odd.


        Hooked up Meter directly to tweeter terminals. Making good contact, and redid it a couple times.

        It makes sound, but just at a reduced level, but not distorted, but maybe just rolled off at a different frequency, did not spend a ton of time on them yet.

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        • #5
          Maybe one of the voice coil wires Is fractured but not completely severed? Would It be possible to keep the multimeter connected and 'wiggle' the voice coil wires to see If the impedance or resistance changes?

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          • #6
            Originally posted by fatmarley View Post
            Maybe one of the voice coil wires Is fractured but not completely severed? Would It be possible to keep the multimeter connected and 'wiggle' the voice coil wires to see If the impedance or resistance changes?


            Will give it a shot

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