2000chrysler sebring coupe Infinity system.
 

I have a 2000 chrysler sebring coupe and it came with the infinity system. it all sounds great but the front door speakers rattle when the music gets to loud so i am gonna replace them with Kenwood KFC-1664S 6-1/2" 3-way car speakers — also fit 6-3/4" openings at Crutchfield.com

I heard there was a weird crossover or ohms thing that goes along with the stock amp in the infinity system so i am just curious to if it will integrate perfectly fine and play nicely.

Ask the seller of the speakers if their product will work in your car.