after about 1.5 years with no problems from my system, all of a sudden my speakers are making a very loud crackling sound while playing music or there is complete silence. i can still hear the sub but nothing coming from interior speakers. most of the crackling sounds like its coming from the front right or back left. i took the door panel off the right door and all the connections seemed ok. i installed this all myself, any advice?

setup below


Alpine 9807 cd player
Alpine SPR-134A
Alpine SPR-136A components
Alpine SWR-1222D 12"
px600.2 amp