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energy es-12

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    Energy ES-12 Subwoofer Whining Noise after Power Down

    I have an Energy ES-12 powered subwoofer. 20 to 30 seconds after turning power off after playing, a sound is emitted (I believe through the speaker) that last 3 to 4 seconds. Sound is similar to a mid-frequency whine from high to low, then stops and all is quiet. The subwoofer performs very...
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