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I know I've seen it before but can't find it now. Looking for complete instructions to interface aftermarket amps (I'm using Zapco), crossovers and speakers (Morel) with my 2019 C7 Bose head unit.
You need an unit like the AX-DSP-MOST1, NAV-TV M650-GM or PAC AP4-GM61 to do it right. Those units will give you a low-level, non-Bose standard RCA audio signal that is compatible with aftermarket audio equipment.
Otherwise you have to tap into the Bose high-level / speaker outputs at the factory amp per this diagram:
However doing this means your stuck with crappy Bose EQ bass shelf, noise canceling and other sub-par audio processing, thus I don't recommend it. Now other people around here have gone this route and seemed pleased with the results. It all depends on your expectations and experience.
Bose head unit interface
