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What components are in the new audio system?
What kind of vehicle?
When do you hear the ringing noise? (All sources? System on or off? Engine running or off?)
Is the ringing noise constant in volume and pitch? Does it vary with engine speed? Does it vary with engine speed? Does it vary with system volume? Does it happen more with one song or type of music? Does it seem to be from one particular speaker or all speakers?
2002 Ford Focus JVC KD-A815 Sony CDX-GT410u Sony XT-100HD HD Tuner Stock speakers, no amp, no subs
could b bad ground,or your ears, i'd double check all connections.
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