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You can measure the DC resistance at the jack. It will be slightly lower than the rated impedance (e.g. 8 ohms impedance might read 6 - 7 or so ohms DC resistance).

EDIT: If you can't easily get at the jack, @laristotle 's approach below will work. Using a short cable is best.
 

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Plug a cable into the speaker jack.
Hold the multi-meter black tip to the sleeve of the jack at the other end of the cable, red tip to the tip of the jack.
 
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