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If you have subs, you will need an amplifier...unless you have cheap wal-mart $10 subs; in which case nothing will help them sound better.
Amplifiers have crossovers built in. A crossover will cut off frequencies to your subs. So you could set the sub amplifier to cut off around 80 hz and it will only produce lower bass.
Your 6x9's and coaxial speakers should be fine running off your head unit. 6x9's are not made to be tweeters. They are full range speakers. It fills in the middle ground. The coaxial speakers you have will have tweeters on them..which will fill in the high end.
If you have after market 6x9's and coaxials you could purchase a 4 channel amp for them as well. This would allow you to customize the frequencies played through them as well.
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