Opinions on Infinity Kappa 682.7cf 2-Way Speakers?

[then00b 10+ year member]

I just got CarDomain to price match the Infinity Kappa 682.7cf 2-Way Speakers down to $97 with free dynamat so I was wondering if anyone has heard of the quality of these speakers? Also, I have been reading on the speakers and it seems that I need to power these speakers through an amp? Could I do that with my 4-Ch amp? Finally, my friend said that I should get a set of back speakers as well since I will blow out my back stock speakers if I upgrade just my front speakers? Is this true?

Thanks a whole lot.

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