+1 the iUsb also helps with cleaning up the output of my iLink converter with my M51, so give it a try. I recommend Fred at Stereodesk. The USB cable also has an effect - I'm using the Nordost Blue Heaven with very good results.
I have a NAD M51 and tried a few USB converter on it. It benefits quite a bit from one - which is not unusual - most do. The best is an Off-Ram, the best value an Audiopholleo.
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