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Hey I was just reading through here and I’m gonna put subs in my Tahoe as well. Just to clarify that harness adapter makes it so the lines aren’t amplified and you could then have your sub on its own amp and speakers on the Bose still?Y91 is the Luxury Bose system found in Denali; your SLT will be Premium Bose (without Y91). The two are entirely different amplification systems.
Attached are the connector end views for entertainment. Note - the "outs" for the subwoofer are already amplified. You would likely need a harness adapter to get line-out before amplification. This one looks like it might work: https://catalog.pac-audio.com/catalog/audio-interfacing/aoem-gm24