i checked my wiring again, and found out that everything was ok before i did the calibration.
i'm getting quite old, and after about 8 hours work on the new setup, i was very tired and out of breath and a mistake slipped by which i did not see when i checked all the connections again just to be sure all was right.
i had also checked on a TV station where the sound was mono...
so now everything is fine and working properly; i just had to reverse a connection on one of the speakers.
so, we just forget about this and go listen to some good music...
thanks to you both for the comments and help. :-)
