yeah. Tap into your rear 6x9 speaker wires for the RCA converter, and run your RCAs from the converter to your amp. You should be fine.
If the amp has high level inputs, use those for gods sake. Inline converters are the absolute last resort you should go to.
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Hell hath no fury like a pissed off balloon animal.
"Sup, G?"
"Aren't you white?"
"Only on the outside, craka."