Right now, I'm using two of my three subs (I need one more amp). I also think that subs become fairly recognizable if you have one. Can you place the subs so that they aren't in mirror positions along the wall (or in exactly opposite of the mirrored positions)? In other words, if one sub is three feet from the front wall, don't place the second sub three feet from the front or rear wall. Instead, try say five feet from the front wall.