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I can't answer all the questions, but I will start with I have the same set-up , METRA + AVIC Z110BT and have no issues.
First, if your using the factory speakers , etc, then you should have chosen NON AMPLIFIED (unless you have the MTX upgrade system?)
Secondly, to get XM to WORK, you had to buy the ADD-ON module for the Z110BT that would allow the XM to work. Then all you had to do is switch accounts from the factory XM to the XM receiver for the Z110BT.
Now, I got my system PROFESSIONALLY installed, but hope the above helps~!
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