Join Date: Nov 2009
Location: Gaithersburg, MD
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Crap, I wanted to stay out of this.
Pretty sure (though not certain - I'd have to check) that MM is correct in what (I think) he's saying. [Weaselly enough for ya?]
The Bluetooth supported by the OnStar box is mono only and doesn't support the Advanced Audio Distribution Profile (A2DP) - so not really useable for music - and because it's routed via GMLAN, may not be very high fidelity anyway. I believe the audio comes out of the front driver-side speaker(s) only - possibly only the tweeter, though, again, I'd have to check.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...