I'm using a Yamaha RX-V681 and a Yamaha RX-V673 to drive mine (different set-ups) and am not close to using all the power to play 75-85 db. The Yamahas are rated at 95w. I have a sub on both systems, but frequently turn it off on the V673 system.

Bottom line if you're using a sub then absolutely enough power; if no sub, them most likely enough power.