Do I have a blown guitar speaker?

[GuitarIv]

Hey everyone, need some help. I just measured the DC resistance of my cabinet. It reads 12.8 Ohms, attached a picture.
Now I know the multimeter reading is a bit off usually plus the speakers are original made in England G12-65s with 15 Ohms rating, but isn't 12.8 very off? I don't wanna risk to blow my OT, especially since I play a DSL 100 and we all know everything after the JCM 800 series had downsized Iron and is not that fit to handle an impedance missmatch anymore.

If a speaker is blown is there any way to tell (apart from putting my ear next to each one)? Please help me out, scared to play my amp right now.

Cheers

[ericsabbath]

most 16 ohm celestion speakers will read right about that (somewhere between 12 and 13 ohms)
8 ohm speakers read about 6 ohms

[GuitarIv]

Ok... just did some additional googling. Seems to be perfectly fine. I'm a dork for not using Google in the first place 
Anyway, thanks Eric!