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benevolus2's avatar
benevolus2
Explorer
Mar 15, 2017

Background hum from stereo

I recently purchased a AM/FM CD player to replace the my old one. It's the type that 'built in' a cabinet above the dinette area.
When ever I put on the radio there's a loud background hum coming through the speakers. There is no hum when playing a CD.
When rewiring I made sure to match the polarity of the speakers.
Any thoughts here?
Thanks.

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