Isolated vs non-isolated DC converters for car audio amplification

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Think star grounding

That is a truly great answer! Accurate too.

Similar to a home amplifier with a "star" grounding scheme emanating from the ground at the filter caps, think of an entire car as the wiring inside a home amp, only with the car's battery as the center of the star. The previously mentioned safety and ground-loop avoidance all works around the principal of all currents originating at the battery and fanning out to all the various systems and subsystems in the car.
 
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