help with carputer

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I am trying to design a 2 din carputer and I have just about everything worked out except how to get 6x rca out for the amps I will be running in the car. I need front, rear, and sub out. My source options are 2.5mm jack, usb, or hdmi. I havent been able to find a board or a dac that will do what I need. I suppose another option would be an onboard amp run to a line converter but I dont want to sacrifice audio quality
 
Ok I just found out that my board will have speakers soldered to it from the factory. I would like to take the signal from those and run to a 50x4 amplifier board and still have 6 rca outs. Anyone know how this would be possible?
 
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