We have started to use USB 3.0 connectors and cabling as they are generally of a higher quality than USB 2.0 ones. The audio standard used is USB Audio Class 2.0 and the connection system is USB 2.0, all USB 3.0 ports are backward compatible and all firmware revisions with version 4.0 or higher work correctly with all USB 3.0 chipsets/ports/drivers. Even though USB 3.0 is faster this is not really significant for 2 channel USB audio, even Hi-Res. What is more important is that the USB standard is superior as the core, grounding, etc, are all improved so this makes for a better quality of transfer of standard USB 3.0 vs standard USB 2.0 cable.
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