Best HPF Crossover frequency for Kicker CSC65

[Slayer16102]

Best crossover frequency for CSC65 2 Way Coaxial Speakers?
No amp and no sub bass installed at all, just a Pioneer 6800BS headunit.
What frequency and what slope do you recommend?

The vehicle that these are installed in is a C5 Corvette so its mostly open space.
Is there a slope thats better to use in a vehicle like this? They are mounted in the front doors.

I was gifted these speakers, so I want to make sure I have the polarity set right.
The manual I looked up online didn't tell me what side was positive and what side was negative.
The bigger prong on the kicker coaxials is the positive side right?
The smaller prong on the speaker itself is the negative side right?
The prongs themselves are two different sizes.

Thank you for all of your help. I will check back on this when I get home from work tonight.

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