Although the USB input is used to power the DAC it does not contribute any significant noise. This DAC is very well designed and gone are the days when the USB input resulted in lots of noise pollution. ASR have run tests on this and it shows excellent results concerning noise and distortion when using USB input. No need for galvanic isolation here or proprietary USB input technology.
However in real terms I believe the USB input is very slightly more noisy than Coax and Toslink.



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Originally Posted by Jimbo

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