need help, replacing stereo
 

i am installing a new aftermarket cdplayer in my 1998 range rover 4.6 hse. i need help finding the stock amp that runs the speakers and i need to know how to bybpass it so i can hook the speakers directly up to my new deck. is there any tips or things i need to know when doing this? i tried using an amp integration wire harness on the leads coming off the old deck going to the amp but that didnt work. where is the stock amp and how can i bypass it?