so I think I realized what the issue it. Decided to pull the H/U out and from what I can see is all the speaker wires have been bypassed.
They had an aftermarket JL 4channel amp installed with components. So basically what they did was splice the factory speaker wires at the DIN location and extend them to the amp under the seat. So no speaker wires are going into the H/U at all.
Im assuming all tuning for treble and bass would have be done at the amp then. Is this the correct way to install aftermarket amp/components?
I know in my tahoe I had arc audio 4080d's hooked up to infinity components and I still had accessibility to adjust EQ settings at my kenwood H/U.
Thanks for the help.
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