Best way to tap into 2016.5 Bose for sub install?

:
CX5 Touring
:
2016.5
I get confused from all of the different threads regrading this topic. Can someone just tell me where/how to tap into the bose system to get the highest audio quality going to the sub? Is it even possible to get original signal from the head unit without a cutoff frequency?

Thank you in advance.
 
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