I was listening to a current drum track and playing with phase switches while in mono. Listening to the low end it sounds the fullest with one over head switched out. The right from the drummers perspective. However, listening to the hi end I can hear a slight filtering type thing with this setup. From now on I will listen for this while tracking, but what adjustment should I make? How far and which direction should I move an overhead when trying to get them to work right with the kit? Up a foot or an inch, away from the other overhead, front to back??? I realize any of these could be right but is the problem the sound getting to the mics at different times or the two mic patterns not covering the area correctly? Are overheads normally the same height off the ground or does it always vary? I need to get a grip on this phase thing!