georgehifi
As for interconnects carrying safety grounds again, you are confused, particularly with respect to balanced connections.
If you were to have a grounded mains plug at the source and the poweramp you have created an earth loop with the ground wire between the power points as the interconnect carry the earth as well.It is clear that you are confused about this issue. The matter of ground loops is only an issue when the grounds are of different potential. Having multiple safety grounds in an audio system is not itself an inherent problem.
As for interconnects carrying safety grounds again, you are confused, particularly with respect to balanced connections.