Ravel F52 Performa - Impedance curve

I was doing a search and was not able to find anywhere what the impedance curve of the speaker is across the entire audio range. Yes, the specs do state the it is 6.5 Ohms nominal imp and in a review I noted the the reviewer mentioned that it dips at its lowest at 387 Hz with an impedance of like 3.5 Ohms.

Does anyone know what is the highest impedance rating on these speakers? It would be awesome if someone can point to a graph of impedance curve if available.

Thanks!