okay so i have an 05 toyota corolla and i bought these 6.5's:
http://caraudiosecurity.com/shop/product/products_id/12103.html
and this stereo:
http://www.kenwoodusa.com/Car_Entertainment/In-Dash_CD_n_DVD_Receivers/1-DIN_CD_Receiver/KDC-MP342U
i had a friend install my speakers on sunday and i've been running them with my stock radio (i don't know if that's bad or not) but i'm going to install the head unit tomorrow. i will have $400 to spend on friday and was planning on getting some 6x9's for the back. my question is with all of this stuff will i need to also buy an amplifier? my friend knows how to install everything so i'm not gonna need to pay for installation. also, will i need to buy 6x9's that have the same wattage and stuff as the 6.5's?
someone please help me out!