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This is the complete guide to installing a subwoofer in a 2023 Toyota GR Corolla and integrating it into the OEM stereo system (finding high level input source), everything is covered in this thorough video from wiring, to fusing, to mild fabrication. Hopefully you find this video helpful as much of the info isn't necessarily vehicle specific.
0:00 intro & overview
4:42 diving in - wire routing and planning
6:01 fuse location and mount
16:35 large gauge wiring - building and routing
27:42 RCA cables - routing and preparing to splice into car wiring
42:01 remote knob wire and knob install in glove box
45:49 re-assembly
47.36 final wiring and assembly