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I'm going to leave them in, they sound okay with the Polks. I got some picks if anybody needs to see any

Putting in new Polk 6 1/2 in doors front and rear and a new deck, my question is what to do with the dash speakers? Can I just unplug them at the speakers or do I have to dig into the wireing some where else? I belive the are robing my new speakers of sound

Thanks for any help