Perhaps Lonnie is right, however, having a room that is 55ft long, i can tell you that in my current system, I can sense the direction and originality of the bass note pretty well, now, the other reason is I do think the mind is able to distinguish the bass note originality below 100hz, so, these dual subs will really cross higher than 50 to the mains, therefore, confusing MY mind a bit on the note's originality...or localization. my 0.02 cents....