speed junk1e

ok check this, my right door speaker and right rear speaker pop and crackle. i know its not that the speakers are blown cuz its not consistent. the speakers work fine for a bit and then all of a sudden it will start poppin like crazy and i hate it!! im guessing its the wiring to the amp or deck thats causing it but im not sure...? so any info on why or how it can be popping like that would be great. thanks..