i have an infinity 12.1 with a jl 500/1 amp. the ploblem is my sub is fluttering with certain notes in certain songs. I know it isnt getting to much power. i have the amp turned WAAAAY down the boost all the way down. i can turn it up and make some really nice loud bass with alot of songs but others just make the sub go crazy so i am unable to ever turn it up because i dont want to screw it up if one of those songs come on. i have 4 gauge wire into the amp and 4 gauge ground. can this be because i used cheap patch cable? or is the amp not getting the power it needs? Also my lights dim alot when its up, could this be causing it? PLZ help im stumped Thanks