Welcome to the forums Seeking

That is an excellent system you are putting together there including the SVS sub. Your Onkyo 606 will power all these speakers without any problems. Axiom towers like the M60 and M80 have high power handling, so in large/grand rooms an external amp can be beneficial for these speakers if you are trying to fill a really big space and need a larger headroom reserve for extreme dynamic passages which occur in a lot of movies. How big is your room, how far away will be your listening postions?

Cheers!

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne