This customer opted to keep his factory head unit, but still wanted clean sound from a couple of Rockford fosgates p2 subwoofers and R500.1 Rockford amplifier. This is made possible by the Pac-Audio AP4-ch41. This digital Integration piece plugs in to the factory head unit via supplied t-harness and offers a crossed over, tuned subwoofer output at 4 or 5 volts to power a sub amplifier, as well as a 4 channel amplifier if you wish to upgrade your front and rear speakers. Makes for a seamless integration.
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