Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
Looks good. The subs flanking the mains will smooth the upper modal range, from ~80-200Hz. In order to do that, low-pass them around 90-120Hz with a gradual slope, second-order preferrably. Let the mains run full range. If there are no noticeable lower frequency modes under 80Hz, then that's all you need. But if you have problems at lower frequency, then you can place a couple subs in the opposite corners or somewhere else in the room, distant from the mains.