I recently got a 2018 Yukon XL Denali. I had a substantial aftermarket stereo installed (used M650-GM KIT to preserve factory head unit & amplifier while providing RCA pre-amp outputs to aftermarket amplifiers, and car was substantially rewired with 0g power wires, re-wiring all aftermarket...
Very impressive insight on system details. I just got a 2018 Yukon XL Denali with Luxury Bose system (RPO = UQS, 10-speaker, IO6 head unit ... Denali package loaded with all bells & whistles) ... What I really want to do is get low level (RCA) inputs prior to the Bose amplifier to input...
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