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Music servers and other computer based digital audio technologies.

And not just for ground loops

- Some DACs are entirely powered by USB drawing several hundred mA. Providing a separate 'clean' +5VDC may be beneficial.

- Some DAC USB receivers are powered by USB drawing significantly less power over USB.

- Some DAC USB receivers require USB power only to enable the DAC drawing a just a few mA.

- Some DACs require no USB power at all. In these DACs the USB receiver is powered by their own internal power supply as was the case with my Ayre QB9-DSD DAC.

As such, some USB DACs may benefit from spitting out the USB +5VDC with a Y-cable while others will see no benefit at all. To test whether the DAC requires +5VDC on USB at all, you can block the +5VDC pin on the USB-A connector on one end of the USB cable as I did.





Edits: 02/18/21 02/18/21

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