I can confirm with Logic 7 off in satellite radio, my rear speakers do NOT get any sound. Incredibly strange.
I tested with my Apple Car Play audio and the same is not true, I get sound out of the rear with or without Logic 7 turned on.
I'm willing to bet it shouldn't be that way - there is no reason one Stereo audio source works properly and another doesn't. It's incorrectly programmed, there is no other excuse.
2019 non-competition for reference.
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