On a more technical note, the listening differences could actually be a function of the thermal differences in your listening environment. Temperature/ humidity/ pressure can change the way sound waves are transmitted and reflected off of the walls, windows, etc.
Just something else to consider.
The Rat.
The Rat.
M80s, VP-150, QS8s,
SVS PC 20-39+, OPPO,
Onkyo 703s, Harmony 880
Sony 60" SXRD HDTV