Are Pass Labs XA60.8 mono amps enough?

It’s not the power that is not enough. It’s just your purchasing amplifiers that are way under the quality of your speakers.

Those Focal speakers deserve better!

Try AGD amps instead or a used Burmester 911 mk3 or DartZeal 

Pass labs uses mid grade capacitors and decent parts but very old old old old circuit designs where they focus the most on the first watt. They won’t give you the dynamics of more sophisticated circuit designs.
They won’t have as much grip with lower depending factor than Burmester.
They won’t sound as musical as AGD and won’t have the air on top of soulution or DartZeal. The 50 watt class a Gryphon Essence would be perfect as well. It is class A and doesn’t run out of gas as the pass labs will. It also will sound more accurate with better tone, texture, dynamics and air with more microdynamics and less color of pass labs house sound.

Think of pass labs as a 1980’s Mercedes S class and the more modern amps like BMW M4 Competition Xdrive coupes. 
you don’t need a Ferrari or hyper car to get 95% out of your speakers but that old Benz will be surPass labs and will be less than capable.

@willyht You never drove a new M4 so you don’t have a frame of reference.Look up the drag races on youtube.