I could add the device to the alsa-lib blacklist but that would not
solve the problem, just remove the S/PDIF connection.

I think the key to understand this problem is:

Device iec958:1 doesn't support 44100 Hz, changed to 46875 Hz.

Now that's a weird sample rate. I wonder if this is actually the case, i
e, that the true sample rate of the speakers are 46875 Hz, or if there's
something in the lsusb device information that's wrong. Do you get any
sound out of your speakers with this command?

speaker-test -c 2 -D plughw:Device -t sine

...and if so, are you able to figure out if the sample rate is actually
46875 Hz or if the tone is detuned? :-)

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https://bugs.launchpad.net/bugs/1074783

Title:
  ArtDio NB-005B USB Speakers Stopped Working in Ubuntu 12.10

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