As far as I know, the standard itself with colors and pins connected to them was created for the convenience and safety of installers, which sometimes is irrelevant because most of the neon checks where the phase is, the same as the standards (I do not know if it exists in PN, but some European countries for sure) regarding light switches; we set them so that when turned off, the top of the flap is pressed so that dust does not collect. So it is not likely to have an impact on audio equipment, especially since equipment in the class of home appliances rarely uses a protective conductor. If it is, however, it would be best if it was connected to the proper protective conductor and not to the transformer zero; the voltage differences can then be of the volt range, which can sometimes be dangerous.