Ohm meter reading off. What does this mean?

[95lincdog]

I have a dvc 4 ohm sub. Each coil reads 4.5 ohms on my meter. Wired in parallel, it reads 3.3 ohms. Wired in series it reads 6.9 ohms. Is the sub damaged? Or maybe because I have a cheap meter? The sub doesn't sound too good, but my amp isn't strong enough to push it. It's 600w rms, my amps are only doing 380w rms each I think. The readings were taken on the sub, out of the box, disconnected from the box. Any ideas? Thanks

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[negolien]

Well hard to say.. I do know that DMM's like mine are usually off a little. When I touch my leads together on ohms it reads .5 Thus when I read a 4 ohms coil it reads 4.5...Best thing to do is touch your leads together see what it reads. Then when your doing a reading deduct that amount from what your reading says.

 

[Popwarhomie 5,000+ posts]

This^^^

Fresh battery can help too.