How to add a sound system to my car?

How do i go about adding some speakers to my rear shelf on my car. I have a cd player and two speakers already but what amps and stuff would i need for say adding two 300watt speakers?

Answers:
would get yourself a good sub/amp first, upgrade your front speakers to the dearest you can afford and amp them instead. its the speakers in the front that the driver hears, and a 500/1000watt sub should pump out enough bass to have the car shaking
you will want a 600 watt amp but to be safe I would go with a little higher wattage amp. If you are trying to put two new speakers in your back shelf where there isnt' places for them you are going to have to custom cut out holes for those speakers. Put all the wires where those are suppose to run though. and just hook it all up to your CD player.

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