When Bi-amping is there change in sensitivity

I am thinking of Bi-amping my speakers with a 80 wpc tube amplifier driving mid & high frequencies and a 500 wpc solid state amp to drive the LF driver. I was wondering if the tube amp will be able to keep up with the same volume levels as the solid state amp. I assume that it would be possible if there were difference in sensitivities for the LF and mid/hi frequencies. Does anyone know if the sensitivities change when bi-amping or if it stays the same because of the crossovers?
thanks