Why would you need class A for tweeter & midrange, but class AB for woofer?
It doesn't matter if it is class A or AB.
I would recommend ATI amps for all your needs:
AT1202 = 120WPC x 2CH into 8 ohms @ 0.03% THD
AT6012 = 60WPC x 12CH into 8 ohms @ 0.03% THD
AT602 = 60WPC x 2CH into 8 ohms @ 0.03% THD
Not much difference between 60W vs 80W. The AT600 amps output 85W into 8 ohms at 1% THD.
I own the Linkwitz Orion 3.2.1. It is an active tower speaker. Each speaker requires 4Ch of amps. So I have the ATI AT6012 amp driving all drivers.
One thing to keep in mind is that
Active speakers are not like passive speakers when it comes to power.
You do NOT want to drive your active speakers with more than what is recommended because active speakers are a lot more prone to be damaged by too much power!