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You can leave your Aura on Full if your using passive crossovers. If not you need a to be able to control the freq. going into both the tweeter and the midbass (either through the headunit or an external crossover)
You don't wanna run your amp on full tilt or full bass boost also. Ruin your amp very quickly... LP on the amp should be at around 80, but if you have that set you have no need for the headunits crossover. If you do decide to use the headunit as your crossover, make sure you put the sub amp to full otherwise your double crossing. Also... You shouldnt have treble running to your sub...?
Pointing to the rear is best... not so sure about having it as close to the back as possible but just move it around to see where it sounds best.
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