How much was the magnetite and where does one buy it?
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More Flat Earth Science! Only a true earth ground (copper rod driven into the soil outside) has ANY benefit! That is how lightning protection works (by shunting the HV charge to the path of least resistance). Next best is connecting grounds to a cold water pipe - as long as it is an all-metal pipe running to the main water source.
My guess is that the perceived benefit is the result of the wire + magnetite that is connected to the DAC’s circuit ground acting as an antenna, and introducing RF energy that it picks up onto the DAC’s circuit ground. Resulting in some combination of intermodulation effects, jitter effects, and/or low level high frequency noise effects which happen to be euphonic.
The fact that this is in a "downtown high rise building," which is no doubt replete with numerous sources of RF energy, would seem to add credence to that hypothesis.
Plus I’ll run to other components and report back.
Doing this with multiple components (connected to the same bag of magnetite) **might** result in ground loop issues, causing hum and/or low level high frequency buzz.
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