I agree with Clbeanz. You are talking about 2 different systems in two different rooms, correct? The fact that switching speaker leads doesn't make a difference supports this theory, about the room that is. Try reversing speakers in the original room where the voice is on the right. It shouldn't shift sides there either, if this is a room dependent phenomenon.
background vocalist moves from left to right
I have 2 systems and have played the same track, "when the stars go blue" by Ryan Adams on each. On one system the female backing vocalist is on the right side of the soundstage, on another she is on the left. Why is that?
I swapped the leads of my speaker cables on the Speaker end on one system and she stayed on the left.
I swapped the leads of my speaker cables on the Speaker end on one system and she stayed on the left.