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15V 3A AC/DC Sony SRS-XB3 Power Supply Adapter for Wireless Portable Speaker SRSXB3 SRS-XB3/BLK SRS-XB3/BLUE - Walmart.com
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The laptop was not grounded and it caused a humming noise I'm the audio output, so I did it myself : r/techsupportmacgyver
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Speaker Line 3.5mm Aux Audio Noise Filter Ground Loop Noise Isolator Eliminate for Car Stereo Audio System Home Stereo - AliExpress
How to troubleshoot a power adapter or transformer that is making a loud humming or buzzing sound. | Sony USA
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laptop - Power supply makes high frequency noise, is it damaging my battery? (or other parts of the computer) - Super User
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