Invert Polarity in Digital Domain

Just curious if anybody has heard any differences with CD players which have the option to invert absolute polarity in the digital domain.

I have the Levinson 390S and I hear a clearer (especially voices!), albeit narrower soundstage with polarity setting to normal (interestingly, the player powers up to polarity=invert as the default). This holds true over a wide variety of discs, and for all types of music. The inverted absolute polarity setting is often more involving, though. My preamp and amp do not invert polarity.

I do not hear any differences at all by inverting polarity on the preamp (in the analog domain), by the way.

Thanks for any input.