I'm thinking of replacing my current speakers with a home theater package from Axiom. I have a couple of questions. What is the advantage of moving from the M1Ti to the M3Ti if I am going to be using a sub? I'm using an Onkyo 575X reciever and I believe that once I connect a sub, the mains default to small, which means they cross-over at 80Hz. This reciever is rated at 70W X5. Will the Epic Mini provide adequate output in a fairly small room (15 x 18) for HT and music?