If you use the crossover in your head unit your going "active" and will require a external amp and a lot more time and effort to setup. Where as a passive crossover "the one that comes with your speakers" will require just one channel per side.
Active 2 way will require a 4 channel amp. 2 outputs for tweeters and 2 for the woofers.
My advice, unless you know about octave, and frequencies. Stick to the passive crossover. Also you may want to go with a lower model because you will not need all that the 80PRS can do.
If you want to learn more about active head over to the DIYmobileaudio site its a lot to take in.
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