Audio Physic Virgo III break in time?

I bough a used pair of Virgo III's about six months ago. I assumed they were broken in already, but I believe I am hearing them open up quite a bit. Does anyone know the break in time for these speakers?

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There might be material applied to the inside of the mid range cones in order to dampen them.

Hard material cones (ceramic and metallic) have a greater tendency to ring like a bell (=distortion) than fibrous paper cones or fabrics . Paper and fabrics can be more easily embedded with viscous damping fluids/materials or weaved in a manner to reduce this form of distortion.

If you suspect a change in the timbre as "open up quite a bit" suggests then you might want to visually inspect the drivers (take them out to see if anything is detached)