"auxiliary" is one of several analog, line level inputs which were all identical. CD, Tape, Tuner, etc. all used the same physical and electrical specification.
The Echo Dot also has a Bluetooth though, so you can pair it with a receiver like this:
https://amzn.to/2TwSFsK
Then connect that to your Xbox via the optical.
Best,
E
The Echo Dot also has a Bluetooth though, so you can pair it with a receiver like this:
https://amzn.to/2TwSFsK
Then connect that to your Xbox via the optical.
Best,
E