Audio over USB iExpress not possible?

I bought these Palo Alto Cubik loudspeakers. They use the USB audio connection and then amplify. But when I plug it into iExpress, they do not appear as possible output, only the minijack input does. So the famous digital signal transport is not worth much. Is there something I should do to use USB speakres with iExpress USB out?

I think you are forgetting that the USB port on the AirPort is a network USB connection. That is a whole different ballgame than a USB port on a computer.
If you would like to see expanded functionality....you should contact Apple directly to let them know.
There is an extremely small chance that they will ever see your post on a user-to-user forum. Even if they might....you will never receive a response from Apple here.
Tell Apple here:
Apple - AirPort Express - Feedback

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