I added amplified 8" sub from Crutchfield's brand, Sound Ordnance B-8PTD 125 watt compact powered subwoofer. I mounted under my 3rd row seat. It put out plenty of power..
I used a used a custom harness from a installer called lljcustoms.com. A perfect plug n play for 2015-2019 and up Tahoe with the Bose system. You can build your harness on there website. I got the Bose bypass harness and added the LOC. There harness also have the amp turn on lead. Everything...
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