my friend has a dual 4 ohm old school cerwin vega stroker that he has told me i can get for $100, the only problem is that i metered the voice coils and they are reading 3 ohms apiece. what do you guys think, does it still have some playing time left or should i not purchase it?

my friend has an oldschool 15'' stroker dual 4 ohm for $100 dollars, my question is that it reads 3 ohms on both coils, does it have much time left in it or should i not buy it. thanks for any info