bhenry:Correct me if I'm wrong, but if a speaker can accurately reproduce sound- does it matter what the source of that sound is?
I don't think it should matter. My priority is music, but movies sound great on the system, too. Clean and accurate sound should be what's needed for any source. Clear lyrics, clear dialogue, the same gear can do both. Kick drum, big boom, whatever, a full-range system won't have a problem.
However, some systems may be optimized for small-scale music, like acoustic soloists, for instance. They might sound really fine with that sort of material, but not so good with explosions, or big orchestras for that matter. For a significant number of listeners, movies (especially blockbusters) may be completely irrelevant, so they don't need to spend their money on a system suited for that, preferring to go for a really sweet low-powered outfit. That's my take on it.