Shizam,
I'd suggest that for comarative listening tests you leave the Audyssey EQ program switched off. You could use it to do the initial setup, but leave the EQ function off for comparisons.
Also, you can zero in much faster on tonal differences and colorations between speakers if you do the A/B tests in stereo.
If you run Dolby Digital 5.1 o4 7.1 and try to do comparisons, it's almost impossible because there is so much going on in the room with multiple speakers that it's very difficult to isolate tonal nuances.
Alan
