Measuring impedance with multimeter


I am measuring a new full range speaker impedance that is advertised as 12 ohms and I am getting  a consistent reading of 4.2. 

I checked the multimeter on another bookshelf speaker advertised as 6 ohms nominal and I get exactly that.

I am using a multimeter at the speaker leads not connected to amp.

Why is this reading so low?
recluse

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