Amplifier??
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Good luck...GD
I ran RCA's into the trunk, mostly because i went cheap on the head unit and the voltage on the pre amp outputs were trash so i put in a line driver then ran powered speaker wires back up front. Back speakers were easy enough.
Also ran a 0 gauged power wires from the battery straight to the back, power the 4x amp and the 1000w sub amp. I always overdue it on wire size for possible future upgrades and the bane of every audiophiles existence is a poor ground.
I wouldn't worry about speaker wires not being able to handle the power, they handle quite a bit. unless you are putting 100+ through them (and thats only at max volume probably only use 20w for normal listening) i assume 6002 is a 60 watt?
But, i would run new wires because why not. Not much soldering, crimp connections have always worked fine for me.











