Retrofit Volvo V60 B&W

[Durii]

Hey guys.
Love all your mods
I chose the way of aftermarket sub JBL basspro SL2 with high level input and willing to instal it to the original location of the oem sub. I have a V60 cc 2020 with high performance audio without sub. Can you recommend Which wire should i tap in under the seat to make it work properly ? 

Thanks ??