Is there an opening on one side of the room that is not on the other side like a doorway? Until you put them side by side in the center of your placement area you won't be able to get any room differences out of the equation.
Vandersteen 3A Signatures with 2 dB difference between L and R Speakers
I just purchased a set of 3A Signatures CPO from a dealer, and was running a frequency sweep using a calibrated mic and it shows a 1.9 dB difference in volume between the L and R speakers. Is this within the margin of being acceptable? I thought these speakers came in matched pairs, do they not?