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Driver continuity test?

Discussion in 'Amps and Cabs [BG]' started by MyDogSkIp, Aug 22, 2012.

  1. MyDogSkIp


    Aug 22, 2012
    Would a ohm meter on the 8 ohm input and/or output of a Carvin Red Line RL410T cab verify driver continuity? And would that verify all 4 drivers are operational without having access to a head?
  2. gearhead1972


    Feb 21, 2012
    Kent NY
    No, a continuity test wont tell you if you have bad drivers. If they are all wired in parallel even if 3 of the 4 are dead you will get continuity. quickest way would be a 9 volt battery touching your speaker wire momentarily and watch the cones for movement, this will also tell you if polarity is correct as they all should move out.
  3. An ohm meter can give a glimpse at one speaker's relative condition. Just remember you are measuring "DCR" not impedance so 8 ohms should NOT be expected.
  4. Jeff Bonny

    Jeff Bonny Supporting Member

    Nov 20, 2000
    Vancouver, BC
    +1. Simple, cheap, tells the tale.
  5. will33


    May 22, 2006
    Battery test.

    Wire up your cabs like you would to hook them up to the amp. Take a 9 volt battery to the end you would normally plug in the amp. + to tip and - to sleeve on the plug should make all the cones move outward. Flip the battery over so it's reverse polarity, and they should all move inward.

    Any that don't move like the rest are blown. Any that move fully, but the opposite direction of the others, are reverse polarity and need their wires reversed.

    That's how it works on most drivers. Some brands, like old JBL's were made opposite, so - moved them out and + moved them in. The important thimg is that all the drivers in your rig are moving the same direction at the same polarity together...as a team.
  6. Mehve


    Jun 2, 2012
    Kitchener, ON
    +1 although the battery trick won't tell you other things, like a tear in a cone, or a bad gasket, etc.
  7. And if the cab has a tweet, turn it off before you do the battery test.
  8. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    No need as the tweeter is isolated by its crossover.

    With the positive battery terminal to the tip the cones should all move out. T'other way round the cones will move in. :)

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