suggest me a head unit

[Florida13 10+ year member]

i need a new head unit.. someone told me when they hooked my speakers up..

they said something how you can control your door speakers etc.. and not just the bass throughout your whole car.

im not sure what its called.. btu one i have now just controls one bass leve, trebel, subwoofer...

any suggestions on cheapest one online? or someone selling any?

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