Stereo/Sound Upgrade

[TheGish]

Has anybody made any stereo and/or speaker upgrades with subwoofers and amplifiers?
I am probably going to pull the trigger on an upgrade soon. But one of the shops asked an interesting question:

Does the AT4 have Active Noise Cancelation (ANS)???
If so, is there a way to retain this technology when replacing the speakers/amplifiers???

Also, how likely is this to void any or all warranties?

 

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[MachoManRandyC]

not sure about the GMC, but, my friend went to car toys and got and upgraded system in his 2019 cherokee and they screwed so much stuff up he did not have his brand new jeep for almost 3 months.
they had to have a tech. finally come out to help them fix the issues. im not sure if i am willing to do an upgrade, and those rear door speakers sound like tin cans from the 50's.

 

[AT4_Guest20]

I swapped out the rear doors for some JL Audio speakers but there was no real difference. There is very little volume in the rear, guessing it has to do with how the Bose system is setup. I didn't feel like digging more into so I left it as is.