Help my Kenwood KDC-248U has power put no audio

[ZackRenner]

I am trying to install a new audio system in my car, but after getting it done(at least i thought it was done), there was no audio coming from my speakers. I have used all but the brown, blue, and blue/white wires to connect to the car, any idea what i did wrong?

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[CrossoverOre 10+ year member]

what kind of car? is it factory amplified? Did you use an integrating harness?