Thanks for your inputs fellas. All speakers working fine this morning. Fade F and R are normal. Bass treble normal.
Wonder what cause the temporary shut off. Perhaps overload from the AUX. ?

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2011 X5 35d 123,000 miles sport space gray/oyster

2005 X5 3.0i sport package Style 211
157,500 miles

2005 Chevy Avalanche Z66 BFG T/A Offroads