I think you'll be fine. It looks like it has preouts, so if you really believed you needed more power, you can always add an amp. Even just a three ch amp for the front three, but I'd say you're probably just fine as it is. It will depend on how loud you like it, how far you sit, etc. I do believe most people, 99% of folks, listen waaay below reference level.
Tell us how it sounds! cheers.