So, finished up the LUX upgrade tonight. I had installed the LUX amp and nav radio, but hadn't connected the noise compensation microphone and split the D-pillar speakers off of the rear doors yet. The LUX system uses a microphone to listen to the background noise in the cabin and adjust for it, whereas the premium system adjusts the volume based on speed. The LUX amp also has dedicated left/right channels for the D-pillar speakers. On the premium system the D-pillar and rear doors are tied together in a connector at the driver's kick panel. So, it required running a set of wires from the amp to the kick panel to connect them like an Escalade. I then had to use my Tech2 to re-calibrate the amp for an Escalade to turn on the D-pillar channels (this amp reportedly came out of a Sierra Denali, so no D-pillar, and therefore the channels were turned off).
I was skeptical that the LUX system would make that much difference, but I have to say that it is a huge improvement over the premium Bose system. As others have commented, the LUX system isn't going to win any stereo contests, but for a factory system it sounds pretty darn good. I forgot to take pictures of the amp install while I had the console apart, but here is the finished system.
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