Is this a good setup?

[Bear Hugger]

Sony 4" car speakers: http://www.audio-warehouse.com/web/mdl/XSW4021/detail.asp

with Creative Inspire T2900 speakers:
http://www.newegg.com/app/ViewProductDesc.asp?description=36-116-134

I think there both 4 ohms so I dont think it will have a conflict, but I will admit Im wiring illiterate so I want to know if wattage or polarity or another misc electric property will make these components fry if I try to splice and solder the wires

Question #2, would this setup give typical computer-speaker quality sound or yield garbled muffled audio?

And for question #3, would you go with the Happ square or circular speaker grille? Do I fold the corner flaps of the Sony speakers and go with the circle grille? Do the flaps serve a purpose, so square grilles would be necessary?