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Your phone is isolated to Ground and to the 240V power.
RCA from somewhat else as a sound source is not isolated, it can have voltage to Ground. Sometimes very high voltages… i found already antennas with 190V (!!!)
Measure before plugging in the RCA the voltage between source and 8000. Measure ground to ground and signal to signal. There will be some voltage. Use DC and AC (!!!)
Use 1 (!!!) multi power plug/cord for source and 8000. Then the voltage should be gone.
If gone, your house installation has a problem.