Even really good, really expensive speakers don't get it done by themselves on movies with bad mixes. And there are many movies with very high production values with bad mixes. Christopher Nolan, jerk that he is, once famously said that it doesn't matter to him that sometimes dialog in his films is unintelligible, because to him it's sometimes just there for flavor, as he wants the audience to feel confusion about what's going on. Ostensibly because I guess he thinks that draws them further into the world of the film. I just think it's self-indulgent and annoying. I like many of his movies, but I don't like that aspect of it. A little off topic, I know, but the point is seeking better dialog clarity is definitely a legitimate endeavor on the part of the OP, and sometimes special tools need to be brought to bear.