want to install spkr pair in rear 3rd seat with woofer

[doubleDD]

I have the stock 6 CD changer/5 speaker system with the woofer in the rear 3rd seat, and would like to add a couple of inexpensive 3-5" speakers to this rear area just to get some high end into the back. My daughter is complaining about only being able to hear the low end back there. Has anyone done this, and where is the best place to put them / what else would I need (amp? etc)?

Thanks,

 

[doubleDD]

bump - ANYONE know what to do to install a couple extra speakers in the rear?