Well, you could use the head unit to power those but if you're buying an amp I wouldnt recommend it. If you buy component speakers, they will come with a crossover, splits the speaker signal to the tweeters and woofers, so for the front of the boxster, you can drive a two-way system off a 2 channel amp. You could run a 4 channel amp and bridge the other two to drive a sub, or use the 2 channels for rear speakers if you so chose. The factory system has a harness from the head unit, to the factory amp up front, and then back through another harness to the speakers. You can re-use the factory wiring, just place your amp in the front trunk and tie into the factory harness, but do run your own RCAs from the head to the amp.
Hope that helps
Patrick
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