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[robwi]

Got a new NAD D3020 Amp. I can get optical Realtek Digital Optical from my computer to work, but NOT the higher quality USB input.  NAD tech no.1 felt that it was a setting in JRiver that was the problem.  Another tech sent me a new NAD D3020 unit after I demonstrated that even with the simple Windows 7 sound check, that the USB input on the NAD would not even play Windows test tones (Control Panel, Sounds, playback devices).  I assume that when JRiver is unopened, it doesn't affect the computer's audio.  I just got my new unit, and it doesn't work either.  Any ideas?   I'll also mention that I have a dragonfly usb device into powered speakers that works fine.

[JimH]

If it works with the Dragonfly, that proves JRiver and Windows are working.

Test from the Control Panel Sounds.  If it doesn't work there, it won't work with MC.

Try a different USB port and cable.

Try another computer if you can.

[astromo]

I've got a NAD C390DD and USB works fine. And I've tested it with high res files just for fun.

I thought that it may share the same USB driver as the D 3020 but from checking the NAD website, no such luck.

I'm with Jim, doesn't make sense that if MC+Dragonfly+Windows works then the audio delivery path is confirmed. Just to be sure, have you tested with another audio playback software as a cross check?