He he he. Today I was boring and made a changes in my system. The two Rti6 surrounds was replaced for 2 Csi3 and I think was great. The 2 Rti6 are now on surround back channel. I donīt know why the Csi3 in that position sounds better and the Rti6 sounds better than Csi3 for Back Ch. Somebody can explain me?