Why sound is not balanced?

I also recommend Pzuckerman's suggestion as I have a similar problem. I did the same tests and afterwards concluded it must be the room.

Now my room is 18.5 x 15.5 and it is pretty rectangular, but unfortunately I have a huge window on one wall which happens to be the side of the room where the left channel speaker is placed. In addition, the ceiling has dips here and there and the walls are not perfectly level. Bad construction in general. My next step is to try to work with my room treatments to see how best to correct the problem as much as I can.

Adjusting the balance was not helpful in my situation because by the time I found a good setting the center image lost focus.

In my system, I did try swapping transports (then other components), but no improvement. While I have the window on the wall where the left channel speaker is placed, there are also two openings on the wall where the right channel speaker is placed. One towards the rear corner and the other towards the front corner.

One thing that Steve Deckert at Decware advised me to do is to rotate the speakers 180 degrees so they fire in the opposite direction. Then set up my room accordingly and see what happens. This requires a tear down and re-configure of the system and I've been too lazy to try that yet.