How can I tell if it's a 2 ohm or 4 ohm subwoofer

[jfagen23]

I bought 2 12 inch sundown audios from my buddy who had no idea if they were 2 or 4 ohm I can't find find any difference or way to tell.. any ideas?

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[rfluvinmf 10+ year member]

Digital Multi Meter (DMM)

https://www.amazon.com/Craftsman-34-82141-Digital-Multimeter-Functions/dp/B000X5TSUA/ref=sr_1_5?ie=UTF8&qid=1466325855&sr=8-5&keywords=digital+multimeter

 

[Vocaloid]

Yep; meter.

Or the rubber guard on the magnet... does it come all the way around the back of the magnet too? Slide that off if you can and see if there is anything stamped in there.