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Engineers are rewriting the rules on how car cabin noise is measured

For decades, carmakers treated cabin noise as a single number problem, something to be tamed with thicker glass and extra ...
Ars Technica

Ground loop isolators and sound quality

So in my car I think i have a ground loop problem, but im not positive. Its sort of a cyclical noise, so its quiet, then buzzes, quiet, then buzzes, etc. Its not terribly bad, I really dont notice it ...