You definitly have to add an amp for the sub or get a powered one but do you have to add either two 2 channel or one 4 channel amp for the front and rear speakers or does it have its own power? Most head units with internal amp have in the neighborhood of a 4 x 35 to 4 x 50 peak amp. Also, does the Pioneer have a seperate sub out? Guess I could go follow your link
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I don't care about the "Jeep thing"
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Slate Blue H3 Adventure w/sunroof, Monsoon/NAV, DVD and marker lights