connecting coaxials to an amp

How's it going guys and gals. I'm currently installing an amp to power my JLs. I have components in he front which work fine, however my rear coaxials aren't receiving any power. My buddy tells me I need a cross over for the rears, but I think otherwise. Can you help me out?

 

Is your amp a 4 channel or 2?

 

You don't really need crossover for the rears. Check the fade on your radio. Like Kyle said is it a 2 channel or 4 channel amp? If its a 4 channel amp swap the RCA on the amp from the front channel to the rear channel and see if you hear sound in the front speaker, this will eliminate the radio and rca wires. Let me know what happens and I can help you further.

 

its a 5 channel hiphonics. the 5th channel is for my subs. the fade is normal. i did what you suggested godofspeed, and i switched the RCA from the front channel to the rear, and i dont hear any sound. woe is me im so confused.

in another update, switching the RCA to different channels did yield sound in the rear speakers, however they are not powerful. and i cannot get all 4 to play.