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Join Date: Oct 2001
Location: Monterey Park, CA
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That will fill the room. For consistency, I would replace the M30s in the back with another pair of M40s, since you're using them for your fronts and sides anyway.
Placement (speakers and seating) will help you get smoother frequency response. For smoothest sound, the seating (listeners' ears) should be 5 feet from the back wall. I would place the front speakers 8 feet apart on the front wall, side speakers directly to the sides of the listeners (or slightly forward), rear speakers 6 feet apart on the back wall, subs at the midpoint of front and back walls.
Consider adding some room treatments (absorption) across the front wall and the middle half of the back wall.