Questions for adding sub to 22 B&O

[Redline8k]

Looking to add a sub amp with a loc. Where is the best place to grab the signal? Are the wires going to the sub already crossed over? Or can I get the signal pre amp somewhere. Not sure how long I’m going to keep the st so I don’t want to jump in a replace the whole system. Sorry if this has been beat to death I couldn’t find a definitive answer

 

[spike5150]

definitive guide:

https://www.explorerst.org/threads/added-a-rockford-fosgate-amp-and-jl-audio-10-sub.5164/

I tapped the same wires to add a sub before I gutted the whole system and went nuts with upgrades.

 

[Gadgtfreek]

On top of that, the spare tire well works great for hiding. This was on my 2019 PP2. JL 10, JL speakers and RF amp.