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I was wondering if some people here could give me some recomendations on what one of these two speakers i should get?

Here are the links to each one:

http://sonicelectronix.com/item_8551_Alpine+SPR-57C.html

http://sonicelectronix.com/item_4278_Infinity+Kappa+682.7cf.html



Please tell me which one you recomend, and WHY?

Thanks in advanced.

I wouldn't recommend either (although they are both good companies), simply because they are an oblong speaker... for better quality sound, make a baffle or have it made and throw a 5.25" in there and you'll be much happier...
And if it's for the rears, then you're better off going without

Hmm... okay...

May i ask how much of a difference in SQ is there in 6x8 vs. 6.5?

My best suggestion would be for you to go out and listen to them yourself... You may find the results quite suprising, especially at higher volumes even if only off of a h/u... if you plan on amping (now or down the road) definately a major difference