I was calibrating my system as I have added a new sub. I searched the forum and found Guy Kuo's thread on Avia calibration notes. It is great but I have one question concerning phasing issues. When using the warble tones and checking phasing for each channel I find that the sub performs best in-phase with the left front channel but best at 180 degress for all other channels. I am guessing that it is a positioning issue but I cannot move the sub out of this location. Should I go with the 180 phasing to complement the most channels? To answer the obvious questions that will arise, yes I have checked the left front speaker and it is wired properly internally and externally. Also I only have a phase switch on my sub and not a variable one. I will answer any other questions I have missed. Thanks for the help.