What cross over do I need get???

[Chubzz48]

Ok I've got a ddx470 head unit

IVe ordered a Precision Power PPI i350.2 amp for 2 QP-MR6.5 door speakers

Would a crossover be needed

Please help.

There are some on sonic electronic, I just don't know what to look for... Would this one work? http://http://www.sonicelectronix.com/item_70825_Rockford-Fosgate-PP4-X.html

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