PakJunction

So i finally managed to get my self some audio stuff! well i got a Chinese solid audio 2 way 600wamp!(was a little low on cash)
And yeah some original Kenwood 718's! the amp isnt all that bad! but yeah so ive got my original car speakers on the front doors which tend to distort at high volumes and the 718 at the back?! i have my Old Alpine Type S Coaxial speakers! So i want to know are they nygood? should i install them in the front? and yeah what is the main difference between my speakers and those co-axial speakers? and yes if i install them can those also be connected to the amp and will it sound anybetter? or i should stay with 2 718'S at the back?
Please Help me
Thanks