Car audio help needed!

[myth]

ok... So as you all know I have my new car! But its audio suck, and the pasenger speaker is blown! I wish to put new quality speakers in the car but dont know how... I looked at the rear speakers and there 4 ohms 20 watts! Only 20 watts??? Now what? I dont wish to replace the head unit but it only puts out 20W Do I need a amp? Also what are crossovers, and do I need them? And whats a decent speaker brand?


Many thanks for your help!

I have been doing some reading and I have learned that I need a four chanel amp that has high level inputs so I can keep my stock head unit. I am realizing that the hardest part of this will be running the wires!

what do I do if I have 55W RMS frount speakers and 100W RMS rear speakers? And I have a 400W RMS 4 chanel amp? Wont that give each speaker 100W RMS and blow the front speakers?

[myth]

ok so I need to buy 2 front door speakers and 2 rear speakers and a amp!

Please review these and tell me if it will work...

Amp: http://www.crutchfield.com/S-SVUiXxL...20&I=108R7541A

Rear speakers: http://www.crutchfield.com/S-SVUiXxL...i+car+speakers

Frount speakers: http://www.crutchfield.com/S-SVUiXxL...6002SI&g=52000

[5lab]

front and rear speakers should ideally be the same size as your current ones in order to make installation easy. 20w is actually plenty - if its rms you'd not want more power than 20w..