Your Sony does not likely have a 5/6/7 channel stereo mode on it. So you should listen to CD music in stereo only. The reciever will automatically play the CD in pro logic, which will sound awful because it will almost completely come out of the center speaker.
Most higher end reciever companies, such as Denon, have a 5/6/7 channel stereo which produce excellent full range stereo sound out of all of the speakers.
With the sound quality of the M60's, you will only want to hear CD music in Stereo anyways. You will likely listen to everything in Stereo. The soundstage of Axiom speakers are so large, that the M60's will completely fill your room with sound.
