I would make a single signal ground node at the power supply and isolate it from the chassis (except for maybe some fairly high impedance connection for static drain) which should be connected to earth ground. This way the signal source can establish the ground reference for the active circuits with no current loops. Of course this means using the same isolating style connectors for the return side of the outputs as used for the "hot" side.
Please see this excellent article by Dave Davenport in the diyAudio articles section:
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