It wouldn't surprise me if the Bose system is capable of discrete 4 channel audio output, but as was said, CD audio is stereo only.
At this point, Bluetooth probably doesn't work for surround in most applications because of bandwidth limitations.
I'm not actually sure what Bluetooth specification is in most Nissans at this point, but it would need to be Bluetooth 2.1+EDR to get near the bandwidth required for more than 2 channel audio.
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