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I recently discovered than background noise can get higher in volume substantially if your battery is low. In my case, to drive my three 12" woofers I require more current than the alternator can provide, therefore my battery eventually discharges and needs manual charging. I noticed that when it's very low, the whining noise is simply horrible to a point where you can't hear anything. But as soon as the battery is charged to 50% or above the noise is removed completely.
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