How do i add an amp for a sub to a stereo with a preamp…the car is a 2003 crown vic,stock stereo w/cd change?

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23 crown vic,ford, am/fm cd/cassette witha 6 cd changer

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? Best Answer

  • Factory radios don’t have pre-outs, so you will need anything from a amp with high level input, or a line out converter ( the cheapest way) up to a signal processor, which can get up to hundreds of dollars..
    Good Luck!

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