car audio help! highs mids and lows?

i have 2 front 2 back door speakers and 6/9 speakers in the back window. if i get 2 12s should i get an amp for the speakers cuz i want to be able to hear the highs and the mids and i dont want it to be alll leveled out?
i want to be able to hear the bass as well as the words highs and the mids
 
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