2008 Suburban w/Bose + Nav...adding amps...where to tap wires

[1hawaii50 10+ year member]

I have a JL Audio Cleansweep to install into a 08 Suburban w/Nav and Bose. Do I tap the speaker wires before the Bose amp and run that to the cleansweep, or after the Bose amp? I figured I would tap BEFORE the amp, but a shop in my area is telling me that I should tap AFTER the amp? Any help would be greatly appreciated. I will be running 2 amps off of the cleansweep, and replacing the speakers in the vehicle as well.

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[pentavolvo 10+ year member]

tap before the bose amp for sure, it is a flat/clean signal. honestly u can tap before the amp and get away without the cleansweep