Well, how about the same quality as what the Rockets produce outside? When we watched "Wreck it Ralph" (yeah, we keep it very kid friendly) the explosions were great and the sound was crisp. It sounded good all the way on the other side of our house. Of course, there is a lot of background noise the speakers are competing with (crickets, kids playing, fans running, ac kicking on)...perhaps I'm just over thinking it. I basically just need loud voice and big booms.
I like that link to the Behringer loudspeakers. I have been looking at those on Amazon.