Hi,
So i'm designing an audio device with the chassis connected to GND, it runs on DC 12V via a wall adapter. I run into a quite annoying problem when it's connected to other grounded audio equipment, an amplifier for example :

Using a ground-less power supply solves the ground loop problem but adds a new one : the chassis of the device now as AC current in it, because of the Y safetey capacitor in the power supply connecting the high/low side together. All certified psu's have it and those caps have a leakage current of a few uA (and a hundred volts), if the PSU isn't earthed this AC current flows directly into the device's ground.
I feel the proper way of doing this is to keep the earthed PSU, but modify/add something in the design to prevent the ground loop from taking place... But how would you do that ?
I'm searching for a cheap and easy solution, because I haven't anticipated that in my initial BOM cost :/