I have slight off-center imaging due to room asymmentry, even though I listen in the nearfield, and resort quite successfully to a balance-control tweak to pull the image a bit. As the thread-head states he tried the system in a different ROOM with the same asymmetrical results, I guess we have to assume the problem is electrical. Maybe the pre or amp outputs are unbalanced? 1/2 dB would be enough to pull the image, correct? A leaky old cap in my old NAD amp resulted in such an imbalance. 1/2 dB difference in sensitivity is pretty common with speakers, but that's already been ruled out, eh? Well, good luck, and let us know what it turns out to be!