Lee, there's no difference between music and movies(or music in movies)as to the benefits of using two subs. Either may have significant low bass at a moment in time.

Of course the appearance isn't identical, but I assume that you wouldn't be greatly disturbed by that. Some type of placement(e.g., both up front about 1/4 of the way in from the side walls)can almost always be used which would give satisfactory, although not optimal, results.

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Enjoy the music, not the equipment.