complex acoustical impedance of dipole drivers

Hello members of DIYAudio,

I'm interested in calculating the acoustic impedance for dipole drivers, however I am having a bit of trouble. I have Geddes' text Audio Transducers, but I can't seem to find anything on them. Does an analytical solution exist?

Would it be possible to calculate the acoustic impedance for a driver like the Neo10?

What FEM software packages are members using?

Thanks,
Thadman