Be careful do your homework, the Sasha is far harder to drive especially in the bass and mid bass than the Sophia.
The Sasha would like an amp that delivers current, I don’t think your AR75 is up to it but maybe OK with the Sophia.
"On the other hand, the Sasha’s plot of impedance magnitude and electrical phase (fig.1) reveals the speaker to be a demanding load for the partnering amplifier to drive."
Cheers George