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Testing speakers with multimeter?

Discussion in 'Speakers' started by Figit090, May 17, 2018.

  1. Figit090

    Figit090 Member

    Messages:
    65
    I tested some Klipsch Forte II speakers with a multimeter and one of them registered around 10 ohms while another around 4.7. After I powered them up to test them, both speakers were around 4.7 Ohms (unhooked from amp again).

    Is the change in resistance indicative of anything? Or did I just wake up a dormant capacitor?

    Is this even a worthwhile test for a speaker cabinet, or just testing a whole cabinet circuit with crossover installed pointless?

    The speaker with the 10ohm starting value had some odd rubbing noises that I thought was a blown woofer but turned out to most likely be a really bad connection when I hastily plugged in my amp. I had limited time to test the speakers but at 20 Hertz the questionable woofer sounded like it was rubbing at first. Both put out good bass after I fixed the wire on the amp from what I could tell.

    I was concerned about a partially blown voice coil but I don't know. The cabs are in good shape and I think you'd have to really abuse these top pop them.
     

     

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  2. woodj

    woodj Super Member

    Messages:
    3,461
    No.
     
    F1nut, Figit090 and Chris Brown like this.
  3. Drugolf

    Drugolf AK Subscriber Subscriber

    Messages:
    4,172
    Location:
    Boise
    Everything pretty much need to be out of circuit to test with a DMM, and even them the resulting data is meh. Good enough for testing if something is open or not.
     
    Figit090 likes this.
  4. Figit090

    Figit090 Member

    Messages:
    65
    LOL. Short and sweet, thank you. I got to thinking after I tested and realized... It probably doesn't do any good.

    Ah, ok thanks! I appreciate the prompt replies.
     
  5. Porkloin

    Porkloin Oscar Heil Groupie Subscriber

    Messages:
    2,857
    Location:
    Kent, WA
    Putting an ohm meter across the terminals of a speaker will only give you the DC resistance of the woofer and it's filter inductor. Because capacitors won't pass the DC from your meter, nothing with a capacitor in series with the driver (high-pass tweeter and band pass midrange) be be part of the read-out. The only thing a VOM is good for in diagnosing speakers is looking for breaks in a circuit.
    Regard your before/after readings as some sort of fluke
     

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