castleofargh
Sound Science Forum Moderator
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not an easy one.
the 16/48 thing is what the usb dongle wants from what I see on the nad specs. if the buffer in foobar is not too small that shouldn't be the issue, but just in case did you try converting some songs beforehand so that foobar would just have to play them as is? not much hope on that one TBH but you've already done the obvious outside of trying to get another USB card. saying you can make noise with your mouse suggests a problem(most likely a grounding one :'( ) between the pc and the dongle, so the DAC would have nothing to do with it. else I would suggest trying to plug the DAC or amp on some other maybe cleaner power sources(try in another room or try to unplug a lot of stuff on the same circuit in the house just to check).
did you check with a wifi analyzer if there is a lot of traffic on the 2.4ghz in your room(again what's one the nad specs)? I'm not super convinced again. your mouse can be heard in the output, so it would suggest that the problem is with the dongle and the computer, and not so much between the dongle and the DAC.
all of those are kind of far fetched, but you already went through what would be the most logical stuff.
the 16/48 thing is what the usb dongle wants from what I see on the nad specs. if the buffer in foobar is not too small that shouldn't be the issue, but just in case did you try converting some songs beforehand so that foobar would just have to play them as is? not much hope on that one TBH but you've already done the obvious outside of trying to get another USB card. saying you can make noise with your mouse suggests a problem(most likely a grounding one :'( ) between the pc and the dongle, so the DAC would have nothing to do with it. else I would suggest trying to plug the DAC or amp on some other maybe cleaner power sources(try in another room or try to unplug a lot of stuff on the same circuit in the house just to check).
did you check with a wifi analyzer if there is a lot of traffic on the 2.4ghz in your room(again what's one the nad specs)? I'm not super convinced again. your mouse can be heard in the output, so it would suggest that the problem is with the dongle and the computer, and not so much between the dongle and the DAC.
all of those are kind of far fetched, but you already went through what would be the most logical stuff.