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Measured impedance of Polk Audio DXi drivers/components

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Hey all,

I've got an Alpine PDX-5 driving the following:
  • DXi 6500 components (front)
  • DXi 650 coaxials (rear)
  • DB1040 SVC subwoofer
I took the DVMM route to setting my gains, and decided to do the voltage calculations based on measured impedance. Things ultimately sound good, but I saw something strange...

The DXi's are 4 ohm speakers, however, the measured impedance was only 2.8 ohms for all of them (the subwoofer measured at 3.7 ohms, which is on-par in my book).

Is this common, or is something botched? To measure, I simply set the multimeter to the 20 ohm setting and measured through the hot-plug connectors that Alpine provides (disconnect from the amp first, of course).

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