Speaker signals

[Jmax]

I added rear 6.5 speakers on the roll bar via a kicker key amp but my speaker install guy pulled the signal off the front speakers (I faded to front right and left to verify where it is coming from). He said that he actually pulled it off the oem amp on the back right in the truck area because that’s where all the signals go. There is a little buzzing noise. Anyone know if there is a full signal going to the rears speakers that I could pull a signal from? I would like to maintain surrround sound if possible plus I’m hoping that may eliminate the buzzing noise which back from my install days happened sometimes if I ran speaker wire next to a power wire that wasn’t shielded properly “interference noise”.

what am I missing?

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