Soo just recently my rear speakers started making this werid popping noise that gets progressivley louder when you turn up the music, i hadnt done anything new to the amp before this started and it ONLY happens on the rear speakers. If it makes a difference my rear/front speakers are ran off 2 seperate RCA cables. Anyone have any idea? ive checked connections on the speaker and amp and everything looks fine. Im thinking its either bad RCA cables or the amp is going to shit...

Try switching things out to narrow down the problem. Switch out RCAs, then switch out amp with another, then try some different speakers. Or since you have a 4 channel amp as it sounds, just switch the front and rear speakers at the amp. if the noise then travels to the front speakers, it's head unit, RCAs, amp, or speaker wire. If it stays at the rear speakers, it's the speakers. Then you can narrow it down further from there.

Yea I did that last night and if I swap the rcas the noise travels to the front speakers, in going to check behind the HU today but it sounds like when you conect neg and pos on a battery and it makes that noise when it sparks up

Then it's either the RCAs getting pinched or have a short in them, or the head unit. Look over the length of RCAs.

Well I checked the rcas and everything looked fine.,, but the plot thickens. I unplugged the rear speakers completly and still heard it barley through the front speakers...I'm starting to think it's the amp now...but idk what could have gone wrong since I haven't done anything new with it in months

Are you sure it wasn't actually in the front speakers a little originally, just that it was so much louder in the rear speakers that you paid attention to them more instead and didn't notice it in the fronts? Try plugging an ipod or something into those same RCAs to send the signal to the amp instead of the head unit.