[Shumax]

2023 Turbo premium with BOSE. Anyone know which cable is + and - on the BOSE sub in the spare tire well? Going to tap into it for signal for my REAL sub…!😎👍

 

[RedBaron]

Phase is a funny thing in acoustics. You should probably try both ways and see which sounds better to you. (Most in-home powered subs have a phase switch for this very reason.)

 

[Shumax]

For those that tackle this in the future, there is a pink and purple wire that goes into the harness that connects to the factory BOSE sub. Inside the sub enclosure, those turn into red and green. Red is positive, green is negative.