Some people have preamps or amps that invert phase. So, they would have to invert phase on the CD player to compensate for that. As already mentioned, some CDs are recorded improperly or mastered improperly with inverted phase.
It's usually easier to detect inverted phase in tracks with a vocalist. If it sounds like the singer is recessed behind the speakers or the background instruments seem closer than the vocalist, try the phase button. If the vocalist comes forward, you're in the right phase.
It's usually easier to detect inverted phase in tracks with a vocalist. If it sounds like the singer is recessed behind the speakers or the background instruments seem closer than the vocalist, try the phase button. If the vocalist comes forward, you're in the right phase.