I am thinking of upgrading to audiophile grade headphone equipment. Mostly to watch music videos on my big-screen flat-panel television. I have a 82 foot USB extension cable with its own far end power supply. This is what gets my music videos from my computer to my sound system. If I replace my present sound system with a USB DAC, headphone amplifier, etc. does this type of equipment have provisions to filter out power supply noise from the USB connector?
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