Benefit of shielded ac wire? Any downside?

Sharper sounding but actually dirtier transients, combined with a subtle mushing of the dynamics.

Basically the same thing it does to all audio cables, but on the AC.

Immunity/separation/isolation from some types of noise.... with a side order of signal damage.

teo_audio said it all tec like, but that is the just of it. Different combinations of shielding can KILL the dynamics of an amp because of a "power cable". Poorly designed power supply doesn't help either along with a incorrectly shielded power cable and then use an AC filter and maintainer.  Disaster, SQ wise, if your not careful.

Regards

@oldhvymec. Tmi :)

@teo_audio and Miller carbon. I'm speaking of the in wall wiring. Would like to be further informed. I understand? Wire acts as an antenna and thought?  10 gauge shielded wire from the breaker box to the receptacle would be a good idea. Thirsty for knowledge :)

@ mijostyn. Thanks. How/why did you decide on this?